Bit (noun)

1. A small piece or amount of something.
2. A unit of measurement of computer data, equal to 8 binary digits.
3. A tool or device used with a drill or screwdriver to hold or drive a screw.

Origin:

From middle english bit, from old english bite.

Examples:

1. A bit of cake fell on the floor.
2. The computer can process 8 bits of data at once.
3. The drill bit broke off in the screw.
4. She gave me a bit of advice.
5. A bit of salt makes the food taste better.