Memcached is an object caching platform, which is used to boost the overall performance of database-driven sites by caching the queries and the replies between the user and the server. To put it differently, every time a particular page on such a website is requested, the script sends a database query to fetch the information that should be displayed to the visitor. If the latter clicks on a hyperlink to go to some other page, the entire procedure is performed again and this results in a lot of database requests and higher load on the server, even more so if the site has a lot of concurrent visitors. Memcached "memorizes" this exchange of information, so in case any of these pages is opened again, the script no longer has to request any data from the database, since everything is delivered by the caching platform. In this way, the overall loading speed of your site will "soar" and you’ll get more happy visitors and they’ll be able to navigate through your website faster. Besides, the Memcached platform updates its cache every time any info in the database is edited, so the site visitors will never see out-of-date data.