Memcached 是一个高性能的分布式内存对象缓存系统，用于动态Web应用以减轻数据库负载。它通过在内存中缓存数据和对象来减少读取数据库的次数，从而提高动态、数据库驱动网站的速度。Memcached基于一个存储键/值对的hashmap。其守护进程（daemon ）是用C写的，但是客户端可以用任何语言来编写，并通过memcached协议与守护进程通信。(Memcached is a high-performance distributed memory object caching system that is used for dynamic Web applications to reduce database load. It reduces the number of read databases by caching data and objects in memory, thus improving the speed of dynamic and database driven sites. Memcached is based on a HashMap that stores key / value pairs. Its daemon (daemon) is written in C, but the client can write in any language and communicate with the daemon through the memcached protocol.)