SSD named SOLID STATE DRIVE. In a base level, it is a new type of storage drive that’s similar to a hard drive, but faster and more reliable. It made from solid state electronic storage chip and array on a circuit board.
It uses flash memory to deliver nearly-instant boot and load times, and since they don’t have to mechanically seek out data on a spinning magnetic platter (like a hard drive) to read or write data. Compared with electromechanical drives, SSDs are typically more resistant to physical shock, run silently, and have quicker access time and lower latency.
Also, they are smaller and take up less space in a PC case, in some instances even mounting directly to the motherboard. SSDs applied on most of the computer and their storage is much faster and smaller than HDD equivalent.
SSD divided into a few different options such as SATA, PCIe, M.2 or NVMe, that feeds power and transfers data. The higher speed interfaces such as NVMe over PCIe can increase performance over HDD performance.
While the price of SSDs has continued to decline over time, SSDs are (as of 2018) still more expensive per unit of storage than HDDs and are expected to remain so into the next decade.