Short for Internet Protocol address. Used to identify computers on the Internet.
When your computer or device sends a request, like a search on Google, it tags the request with your IP address. That way Google knows where to send the response. It works like a return address would on a piece of mail.
You can find the public IP address you are currently using by searching "what is my ip address" on google.com.
About IP addresses (opens in the Websearch Help Center)