Simple Definition:

Alphanumeric refers to a combination of letters and numbers. (Alphanumeric means a mix of both the alphabet and numbers.) For example, a password that includes both letters and numbers, like “Password123”, is considered alphanumeric.

Very Simple Definition:

Alphanumeric means a combination of letters and numbers. For example, a password that has both letters and numbers, like “Password123”, is alphanumeric.