A solid-state drive (SSD) is a data storage device that uses solid state memory to store persistent data. It is a flash based storage device and it uses the same I/O interface developed for hard disk drives. SSDs do not have any moving mechanical components, which distinguishes them from traditional magnetic disks such as hard disk drives (HDDs). SSDs use microchips that retain data in non-volatile memory chips. They use non-volatile NAND Flash Memory, which enables SSDs to retain data when the power is removed.