A solid-state drive (SSD) is a media which uses flash modules in order to save data. The SSDs remain relatively new and more expensive than the classic hard disk drives (HDD), but they are faster, so they are ordinarily employed for Operating Systems and applications on both desktops and servers. An SSD is preferred as it doesn't have spinning disks which restrict its speed and could cause overheating like it may happen with an HDD. A large number of companies employ SSDs for caching purposes, so all of the content that is accessed more often will be held on this kind of drives, while all the other content will be stored on conventional HDDs. The main reason to use this type of a setup is to balance the cost and overall performance of their website hosting platform and to minimize the load on the HDDs resulting from numerous reading and writing processes.