What Is cache? Definition & Guide

Cache is a temporary memory that stores copies of already-processed data or pages, so on the next visit they are served instantly instead of being recalculated or re-downloaded from scratch.

How cache works

The first time you visit a page, the server generates it and the browser downloads images, styles and scripts. The cache saves these elements: on the next visit they are taken from memory, the page appears much faster and the server does less work. It is the same principle that lets a PWA work offline.

Types of cache

• Browser cache: stores resources on the user's device.
• Server cache: keeps already-generated pages on the hosting side.
• CDN cache: serves content from servers near the user.

Cache and performance

A good cache strategy cuts load times, improves Core Web Vitals and lightens the hosting load. It must be managed well, though: if it does not refresh at the right time, users may see old content. In our hosting we configure cache to combine speed with always-fresh content.

Related terms: CDNPWAHosting

Frequently asked questions