A solid-state drive (SSD) boosts the performance of every app running on it in comparison to a classic hard-disk drive (HDD). The reason is that an SSD employs a number of interconnected flash memory modules, so there're no physical parts to move. In comparison, a hard disk employs spinning disks and each reading or writing process causes the disks to move, so the speed of an HDD is restricted. Since the cost of the two types of drives are also different, numerous PCs and web servers are provided with an SSD for the operating system and random applications, and an HDD for data storage, in this way balancing price and effectiveness. A web hosting provider can also use an SSD for caching purposes, thus files that are accessed very often will be saved on such a drive for accomplishing higher loading speeds and for minimizing the reading/writing processes on the hard-disk drives.