Bounce may refer to any of the following:
1. A description of what occurs when an e-mail message returns to the sender as undeliverable. Some e-mail programs also have a bounce or bounce back feature built into them. Using this feature allows you to "bounce" messages, as if the e-mail address is invalid.
2. Bounce is also an abbreviation sometimes used for bounce rate.
3. Bounce can also be used to describe a computer that was rebooted.