---
title: "What is memcached?"
source: "https://docs.nexcess.com/sites-stores/performance/caching/memcached/"
description: "Discover what memcached is and how it can accelerate your applications. Optimize your website's performance with this free, open source caching system."
vertical: "Sites & Stores"
date: "2022-12-02"
last_modified: "2026-06-30"
---

# What is memcached?

## Definition

memcached is a free, open source, distributed memory object caching system designed to accelerate applications on Unix-like and Windows operating systems. Its primary purpose is to speed up data-base driven websites, though it also sees broader use for any applications dependent on a database. Users of memcached include WordPress, Wikipedia, Twitter, Youtube, and Flickr, among others.

## Function

memcached reallocates memory away from system areas with a surplus to the areas with a greater need. Like all caching software, the decreased database load results in quicker load times and more efficient resource usage.

For more information, visit the [memcached website](http://memcached.org/).