Computers only understand binary, binary is only '0 and 1's'. The smallest unit is a bit:
0,1 = Bit
8 bits = 1 Byte
1024 Bytes = 1 kilobyte
1024 kilobyte = 1 Megabyte (MB)
1024 Megabytes = 1 Gigabyte (GB)
1024 Gigabytes = 1 Terabyte (TB)
0,1 = Bit
8 bits = 1 Byte
1024 Bytes = 1 kilobyte
1024 kilobyte = 1 Megabyte (MB)
1024 Megabytes = 1 Gigabyte (GB)
1024 Gigabytes = 1 Terabyte (TB)