A byte

A byte is the smallest addressable unit of memory.

of 8 bits

Most targets have an addressable memory unit size of 8 bits.

a group of bits called a byte (usually an octet, which is 8 bits)

The smallest addressable unit of data is usually a group of bits called a byte (usually an octet, which is 8 bits).

Bytes and Words

Bytes and Words are typically the smallest addressable units of memory.

Bits

Bits are the smallest possible piece of memory in a computer; each one can store either a '1' or a '0'.