A solid-state drive (SSD) is a media which uses flash modules so as to save data. The SSDs are still relatively new and more expensive compared to standard hard disk drives (HDD), however they're faster, so they are ordinarily employed for Operating Systems and applications on both PCs and hosting servers. An SSD is recommended as it doesn't have spinning disks which limit its speed and can even cause overheating like it could happen with an HDD. A lot of companies employ SSDs for caching purposes, so all site content that is accessed more often will be stored on this type of drives, while all the other content will be held on standard HDDs. The reason to use this kind of a configuration is to balance the price and performance of their Internet hosting platform and to reduce the load on the HDDs resulting from countless reading and writing processes.