Using Magento’s cache management system is an easy way to improve the performance of your site. The Cache Storage Management page shows the status of each primary cache and its associated tag. Whenever one of the caches needs to be refreshed, a notice appears at the top of the workspace to guide you through the process.
On the server, the default location for the primary Magento cache is var/cache. As an alternative to using the Cache Management tool, the contents of each cache can be manually deleted from the server.