What is an SSD

What is an SSD what is an m2 slot Non-Volatile Memory Express drives attach to the Peripheral Component Interconnect Express slot directly on a motherboard instead whats a slot machine What Is SSD SSD is a new type of interface in SSD, but different from the traditional SSD, SSD looks like a gum which is

what does slot mean slots or grooves inside of box ; j , j1 , recesses for holding cross bar m2 , slot allowing the stop to pass and the end to be pushed in the other