Memcached is a content caching platform, which is used to improve the overall performance of database-driven websites by caching the requests and the replies between the visitor and the server. In other words, every time a certain web page on such a website is requested, the script connects to its database to get the information that should be shown to the website visitor. If the latter clicks a hyperlink to visit another web page, the entire operation is executed again and this results in multiple database requests and high server load, especially if the site has a lot of simultaneous visitors. Memcached "memorizes" this exchange of information, so if any of these web pages is visited again, the script no longer has to cull any content from the database, since everything is provided by the Memcached platform. In this way, the overall speed of your site will "soar" and you will have more pleased visitors and they will be able to navigate through your website faster. Plus, Memcached "refreshes" its cache every time any info in the database is updated, so the site users will never wind up seeing old data.