Essentials

Essentials is a collection of guides that introduce you to core concepts essential to understanding content delivery networks (CDNs) and Fastly.

A content delivery network, or CDN, is a network of servers distributed all across the world that work together to make delivering content to your users faster and more efficient.

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A cache is a location that temporarily stores data for faster retrieval by the things that need to access it. Caching refers to the process of storing this data.

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Image optimization refers to the process of creating and delivering high-quality images in the right format, dimension, and resolution for whatever device is accessing them, all while keeping the smallest possible file size.

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Cache invalidation, otherwise known as purging or cache purge, is the process of eliminating content from cache ahead of when it would naturally expire or be evicted. Once content is purged, a request for that content will be retrieved from the source rather than the cache.

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