Buffer: A buffer is an active electronic circuit that keeps your guitar signal strong and preserves the frequencies of your guitar sound. If you have a good patch cord that’s not too long, and plug directly into your amp, that is the purest sound you can get, and you don’t need a buffer. If you have long patch cords or a bunch of effects pedals, or a pedal with a weak output, a buffer can help get your sound back to the pure tone you are looking for.
Simple Definition: A buffer cleans up the signal.
Effect Pedal Examples:
Common Internal Components:
Buffer PCB Board
Fifty Favorite Effect Pedals for Sale: