---
title: Content Delivery Network Blog  | Learn - CDN Fundamentals (2)
description: Learn - CDN Fundamentals | CDN Blog | About Content Delivery Network  (2)
image: https://blog.blazingcdn.com/hubfs/logo%20560-560-1.png
---

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[🔴 Live Streaming](https://blog.blazingcdn.com/live-streaming?hsLang=en-us) [📺 VOD & OTT](https://blog.blazingcdn.com/vod-ott?hsLang=en-us) [💰 Bandwidth & Costs](https://blog.blazingcdn.com/bandwidth-costs?hsLang=en-us)

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[💰 Pricing & Costs ▾](https://blog.blazingcdn.com/cdn-pricing-and-cdn-costs?hsLang=en-us)

[Provider Pricing](https://blog.blazingcdn.com/provider-pricing?hsLang=en-us) [Cost Optimization](https://blog.blazingcdn.com/cost-optimization?hsLang=en-us) [Decision Support](https://blog.blazingcdn.com/decision-support?hsLang=en-us)

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# Content Delivery Network Blog | Learn - CDN Fundamentals (2) | About Content Delivery Network

Learn - CDN Fundamentals | CDN Blog | About Content Delivery Network (2)

[All](https://blog.blazingcdn.com/en-us) [Learn](https://blog.blazingcdn.com/en-us/tag/learn) [Learn - CDN Fundamentals](https://blog.blazingcdn.com/en-us/tag/learn-cdn-fundamentals) [Compare](https://blog.blazingcdn.com/en-us/tag/compare) [Video - Video & Streaming](https://blog.blazingcdn.com/en-us/tag/video-video-streaming) [Learn - Advanced Concepts](https://blog.blazingcdn.com/en-us/tag/learn-advanced-concepts) [Pricing - Cost Optimization](https://blog.blazingcdn.com/en-us/tag/pricing-cost-optimization) [Mobile Apps & Developers](https://blog.blazingcdn.com/en-us/tag/mobile-apps-developers) [Pricing - Pricing & Costs](https://blog.blazingcdn.com/en-us/tag/pricing-pricing-costs) [Benchmarks](https://blog.blazingcdn.com/en-us/tag/benchmarks) [Video - Live Streaming](https://blog.blazingcdn.com/en-us/tag/video-live-streaming) [Compare - Provider Comparisons](https://blog.blazingcdn.com/en-us/tag/compare-provider-comparisons) [Pricing - Provider Pricing](https://blog.blazingcdn.com/en-us/tag/pricing-provider-pricing) [Software & SaaS](https://blog.blazingcdn.com/en-us/tag/software-saas) [DevOps & Cloud Infra](https://blog.blazingcdn.com/en-us/tag/devops-cloud-infra) [Media & Broadcasting](https://blog.blazingcdn.com/en-us/tag/media-broadcasting) [Industries](https://blog.blazingcdn.com/en-us/tag/industries) [Pricing - Decision Support](https://blog.blazingcdn.com/en-us/tag/pricing-decision-support) [Tools](https://blog.blazingcdn.com/en-us/tag/tools) [Enterprise & Corporate](https://blog.blazingcdn.com/en-us/tag/enterprise-corporate) [AI & Machine Learning](https://blog.blazingcdn.com/en-us/tag/ai-machine-learning) [Security](https://blog.blazingcdn.com/en-us/tag/security) [Video - VOD & OTT](https://blog.blazingcdn.com/en-us/tag/video-vod-ott) [Learn - By Content Type](https://blog.blazingcdn.com/en-us/tag/learn-by-content-type) [Gaming & Esports](https://blog.blazingcdn.com/en-us/tag/gaming-esports) [Security - Encryption & Access](https://blog.blazingcdn.com/en-us/tag/security-encryption-access) [Video - Bandwidth & Costs](https://blog.blazingcdn.com/en-us/tag/video-bandwidth-costs) [Security - Attack Protection](https://blog.blazingcdn.com/en-us/tag/security-attack-protection) [Compare - Ratings & Benchmarks](https://blog.blazingcdn.com/en-us/tag/compare-ratings-benchmarks) [Compare - Strategy Comparisons](https://blog.blazingcdn.com/en-us/tag/compare-strategy-comparisons) [E-Learning & EdTech](https://blog.blazingcdn.com/en-us/tag/e-learning-edtech) [Security - Video & DRM Security](https://blog.blazingcdn.com/en-us/tag/security-video-drm-security) [Sports & Live Events](https://blog.blazingcdn.com/en-us/tag/sports-live-events) [AdTech & Advertising](https://blog.blazingcdn.com/en-us/tag/adtech-advertising) [Case Studies](https://blog.blazingcdn.com/en-us/tag/case-studies) [Learn - Glossary](https://blog.blazingcdn.com/en-us/tag/learn-glossary)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-15-2026-07-30-27-6922-AM.jpeg)](https://blog.blazingcdn.com/en-us/video-file-formats-explained-containers-vs-codecs)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [Video File Formats Explained: Containers vs Codecs](https://blog.blazingcdn.com/en-us/video-file-formats-explained-containers-vs-codecs)

 A video file is two independent decisions stacked together. The container (MP4, MKV, MOV, WebM, MPEG-TS) defines how ...

 Vadym Borovskyi ·  Oct 15, 2026, 9:33:24 AM 

[Read more](https://blog.blazingcdn.com/en-us/video-file-formats-explained-containers-vs-codecs)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-15-2026-07-00-57-7561-AM.jpeg)](https://blog.blazingcdn.com/en-us/understanding-fastlys-origin-shield-and-its-cost-implications)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [Fastly Origin Shield: How Shielding Works and What It Costs](https://blog.blazingcdn.com/en-us/understanding-fastlys-origin-shield-and-its-cost-implications)

 Fastly origin shield has no separate line item on a Fastly invoice as of 2026. A shielded cache miss is billed as an ...

 Vadym Borovskyi ·  Oct 15, 2026, 9:04:12 AM 

[Read more](https://blog.blazingcdn.com/en-us/understanding-fastlys-origin-shield-and-its-cost-implications)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-14-2026-07-30-23-9310-AM.jpeg)](https://blog.blazingcdn.com/en-us/lossy-vs-lossless-compression-images-video-and-audio)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [Lossy vs Lossless Compression: Images, Video and Audio](https://blog.blazingcdn.com/en-us/lossy-vs-lossless-compression-images-video-and-audio)

 Lossy vs lossless compression comes down to one trade: lossless compression rebuilds every original bit and typically ...

 Vadym Borovskyi ·  Oct 14, 2026, 9:32:43 AM 

[Read more](https://blog.blazingcdn.com/en-us/lossy-vs-lossless-compression-images-video-and-audio)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-13-2026-07-30-24-3649-AM.jpeg)](https://blog.blazingcdn.com/en-us/cbr-vs-vbr-choosing-a-bitrate-mode-for-streaming)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [CBR vs VBR: Choosing a Bitrate Mode for Streaming](https://blog.blazingcdn.com/en-us/cbr-vs-vbr-choosing-a-bitrate-mode-for-streaming)

 For most on-demand video, capped variable bitrate (VBR) wins the cbr vs vbr decision: it spends bits where the picture ...

 Vadym Borovskyi ·  Oct 13, 2026, 9:32:48 AM 

[Read more](https://blog.blazingcdn.com/en-us/cbr-vs-vbr-choosing-a-bitrate-mode-for-streaming)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-12-2026-07-30-18-1504-AM.jpeg)](https://blog.blazingcdn.com/en-us/what-is-a-keyframe-gop-size-and-keyframe-interval)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [What Is a Keyframe? GOP Size and Keyframe Interval](https://blog.blazingcdn.com/en-us/what-is-a-keyframe-gop-size-and-keyframe-interval)

 In answer to what is a keyframe: a keyframe, or I-frame, is a video frame encoded without reference to any other frame, ...

 Vadym Borovskyi ·  Oct 12, 2026, 9:31:59 AM 

[Read more](https://blog.blazingcdn.com/en-us/what-is-a-keyframe-gop-size-and-keyframe-interval)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-12-2026-07-01-19-9802-AM.jpeg)](https://blog.blazingcdn.com/en-us/set-up-microsoft-cdn-via-azure-step-by-step-guide-pricing-inside)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [Azure CDN Setup and Pricing 2026: Front Door Migration Guide](https://blog.blazingcdn.com/en-us/set-up-microsoft-cdn-via-azure-step-by-step-guide-pricing-inside)

 New Azure CDN deployments now go only one way: Microsoft stopped accepting new Azure CDN Standard from Microsoft ...

 Vadym Borovskyi ·  Oct 12, 2026, 9:03:58 AM 

[Read more](https://blog.blazingcdn.com/en-us/set-up-microsoft-cdn-via-azure-step-by-step-guide-pricing-inside)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-10-2026-07-00-45-3145-AM.jpeg)](https://blog.blazingcdn.com/en-us/vercel-cdn-internals-how-edge-network-boosts-nextjs-apps)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [Vercel Edge Network Explained: How Vercel's CDN Works](https://blog.blazingcdn.com/en-us/vercel-cdn-internals-how-edge-network-boosts-nextjs-apps)

 The Vercel CDN puts edge points of presence (PoPs) in front of 20 compute regions, as listed in Vercel documentation in ...

 Vadym Borovskyi ·  Oct 10, 2026, 9:03:30 AM 

[Read more](https://blog.blazingcdn.com/en-us/vercel-cdn-internals-how-edge-network-boosts-nextjs-apps)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-07-2026-07-30-22-8193-AM.jpeg)](https://blog.blazingcdn.com/en-us/what-is-a-codec-video-and-audio-codecs-explained)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [What Is a Codec? Video and Audio Codecs Explained](https://blog.blazingcdn.com/en-us/what-is-a-codec-video-and-audio-codecs-explained)

 A codec (short for coder-decoder) is an algorithm, plus the software or hardware that implements it, that compresses ...

 Vadym Borovskyi ·  Oct 7, 2026, 9:32:17 AM 

[Read more](https://blog.blazingcdn.com/en-us/what-is-a-codec-video-and-audio-codecs-explained)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-07-2026-07-01-07-5337-AM.jpeg)](https://blog.blazingcdn.com/en-us/apple-cdn-infrastructure-icloud-apple-tv-scale-globally)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [Apple CDN Explained: How iCloud, App Store and Apple TV Deliver](https://blog.blazingcdn.com/en-us/apple-cdn-infrastructure-icloud-apple-tv-scale-globally)

 The Apple CDN is a layered stack rather than one network. It combines Apple's own edge caches, many embedded inside ISP ...

 Vadym Borovskyi ·  Oct 7, 2026, 9:03:52 AM 

[Read more](https://blog.blazingcdn.com/en-us/apple-cdn-infrastructure-icloud-apple-tv-scale-globally)

[![](https://blog.blazingcdn.com/hubfs/Gemini-Blog/image-Oct-06-2026-07-30-20-2950-AM.jpeg)](https://blog.blazingcdn.com/en-us/what-is-video-compression-how-codecs-shrink-video)

[Learn](https://blog.blazingcdn.com/en-us/tag/learn)

## [What Is Video Compression? How Codecs Shrink Video](https://blog.blazingcdn.com/en-us/what-is-video-compression-how-codecs-shrink-video)

 Video compression is the process of encoding moving images into far fewer bits by removing spatial redundancy inside ...

 Vadym Borovskyi ·  Oct 6, 2026, 9:32:08 AM 

[Read more](https://blog.blazingcdn.com/en-us/what-is-video-compression-how-codecs-shrink-video)

[← Prev](https://blog.blazingcdn.com/en-us/tag/learn-cdn-fundamentals/page/1) [1](https://blog.blazingcdn.com/en-us/tag/learn-cdn-fundamentals/page/1) 2 [3](https://blog.blazingcdn.com/en-us/tag/learn-cdn-fundamentals/page/3) [4](https://blog.blazingcdn.com/en-us/tag/learn-cdn-fundamentals/page/4) … [43](https://blog.blazingcdn.com/en-us/tag/learn-cdn-fundamentals/page/43) [Next →](https://blog.blazingcdn.com/en-us/tag/learn-cdn-fundamentals/page/3)

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