Hard Drive (HDD)/SSD
A Hard Drive is the storage system inside your computer. They are very chunky and have a record player-like arm and a normal CD-like disk which both help record the information.
An SSD (System State Drive) is the modernised version of the hard drive; the only major differences being that they are much smaller and they have no moving parts. You tend to find SSDs in modern technology and Hard Drives in the more aged technological products. A good thing to know is that SSDs are faster but more expensive when HDDs are slower but a lot slower.