Web Development

What is Caching?

Caching is the process of storing copies of web pages, images, and other assets so that future requests for the same content can be served faster.

Definition

Caching is the process of storing copies of web pages, images, and other assets so that future requests for the same content can be served faster without regenerating everything from scratch each time. There are two main types: browser caching, which stores assets on the visitor's device so repeat visits load faster, and server-side caching, which stores pre-built versions of pages on the server so the database and code do not need to process every request.

Why It Matters for Small Businesses

Without caching, every page view on a WordPress site requires the server to query the database, execute PHP code, and assemble the page from scratch. Under any meaningful traffic load, this creates slow response times and increases server costs. A properly configured caching setup can reduce server response time by 90% or more and is one of the most impactful free performance improvements available.

Example

A local events venue website gets flooded with traffic after a social media post goes viral. Without caching the server is overwhelmed by simultaneous requests and the site goes down for 20 minutes during peak interest. After implementing a caching plugin and server-side page caching, the same traffic spike is handled effortlessly.

Related Terms

Page SpeedCaching is one of the most impactful page speed optimizations

Web HostingQuality managed hosts often include server-side caching built in

CDNCDNs use caching to serve assets from geographically distributed servers

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