Person 1: Do you like these nuts?
Person 2: ...Yes?
Person 3: Well, you might like; DEEZ NUTS
Binary is usually called the Base-2 System. Binary consists of only 0s and 1s, meaning that there are only 2 digits, 0 and 1.
Binary is usually used in computers, as a replacement for base-16, or hexadecimal.
Here is the table for what a number is in: Binary, Decimal and Hexadecimal.
Binary: 1, 10, 11, 100, 101, 110, 111, 1000, 1001, 1010
Decimal: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Hexadecimal: 1, 2, 3, 4, 5, 6, 7, 8, 9, A
Here's something:
Hexadecimal: 1BE15DC
Decimal: 29234652
Binary: 1101111100001010111011100
Base-36: HELLO
Person1: You use Binary???
Person2: it's all just 1s and 0s baby