It's really 2 separate questions. You could have RAID and SSD. There are several kinds of RAID, and most workstations support it on the MB to start with.
RAID 0 uses 2 drives to double performance over whatever is already there. RAID 1 creates a continuos backaup for security. RAID 10 does both. Basically RAID is a way to use several drives at once. RAID cards allow more drives, or newer interfaces than the MB allows.