Why does my samsung tab 3 flashes "teamwin" on the main screen?

[AC Question]

All the screen does is flash teamwin and I can't do anything after that. When I first turn it pon it will show recovery boot then seconds later the team win will start flashing. Is there any way to fix this?

 

[the tall guy]

Hi, is this a pop up that says Team Win? I don't know what that means.

 

[hallux]

Team Win is TWRP, a common recovery that is used by people installing 3rd-party ROMs.

https://twrp.me/

What does this mean? Sounds like a boot-loop on a device with a 3rd-party ROM installed.