A is a single unit of memory and can only store possible binary values, either 0 or 1.

A is a unit of memory made up of 4 bits. This means it can store possible binary values, 0000 to . Numbers encoded using the binary coded (BCD) system use 1 nibble to encode each digit of the number (rather than converting the whole number into binary). For example, to encode the denary number 75 using the BCD system would mean the 7 would be encoded as and the 5 as , using nibbles of memory.

A is a unit of memory made up of 8 bits. This means it can store possible binary values, 00000000 to . The denary (decimal) number 75 could therefore be encoded as binary 1001011, using byte of memory.

1024 bytes are called a (KB). When talking about computer storage rather than computer memory a kilobyte is often referred to as 1000 bytes. 1KB of memory could store roughly one full A4 page of text.

1024 kilobytes are called a (MB). When talking about computer storage rather than computer memory a megabyte is often referred to as 1000 kilobytes.

1024 megabytes are called a (GB). When talking about computer storage rather than computer memory a gigabyte is often referred to as 1000 megabytes.

1024 gigabytes are called a (TB). When talking about computer storage rather than computer memory a terabyte is often referred to as 1000 gigabytes.