An SSD is actually a type of hard drive. An SSD, unlike conventional hard drives has no moving parts, hence Solid State Drive.  Typical hard drives use  spinning discs to encode and retrieve memory.  When a machine needs data from a sector, they spin the disc to the required sector, and read, or write data to or from that place on the disc.  but because there is a physical spin up in order to 'find the information' this takes a significant amount of time compared to a solid state which has no physical momentum to contend with.
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