Chatterbox (noun)

A person who talks a lot, especially about unimportant things.

Origin:

From the verb "to chatter" (to talk rapidly and continuously, often about trivial matters).

Examples:

1. She is such a chatterbox, I can never get a word in edgewise.
2. He is known as a chatterbox in the office.
3. I find it hard to focus when I'm around a chatterbox.
4. She is a chatterbox, always eager to share her thoughts.
5. He is a chatterbox, always talking, never listening.