SSDs are data storage devices that use solid-state memory to store persistent data with the intention of providing access in the same manner as a traditional block input/output(i/o) hard disk drive.
SSDs are different from traditional HDDs, which are electrochemical devices containing spining disks and movable read/write heads. SSDs,in contrast, use microchips that retain data in non-volatile memory chips and contain no moving parts. compared to electrochemical HDDs SSDs are typically less susceptible to physical shock, are silent, and have lower access-time and latency. these are however, more expensive per GB.
SSDs use the same interface as HDDs, thus can easily replace them in most applications.