What are rebound relationships?

Anonymous
What classifies a relationship as a rebound? Is every first relationship after a breakup considered a rebound? How do you know if you're on the rebound or if someone else is on the rebound? Are there any clear signs?

If you're over an ex and then enter a relationship, is that a rebound? If you start liking someone else while in a relationship and then breakup and then enter a relationship with this new person, is that a rebound?
What are rebound relationships?
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