A solid-state drive (SSD) improves the performance of any app running on it when compared to a regular hard-disk drive (HDD). The reason is that an SSD works by using multiple interconnected flash memory units, so there're no physical parts to move. In contrast, an HDD uses spinning disks and every reading or writing process causes the disks to move, which means that the speed of an HDD is limited. Since the cost of the two kinds of drives also differ, many computer systems and web servers are equipped with an SSD for the OS and random applications, and a hard-disk drive for data storage, thus balancing cost and performance. An Internet hosting provider can also use a solid-state drive for caching purposes, thus files that are accessed frequently will be saved on this type of a drive for reaching improved loading speeds and for minimizing the reading/writing processes on the hard drives.