How long did The Undertaker wrestle in WWE?

The Undertaker is one of the biggest names in WWE history. His incredible undefeated streak at WrestleMania is probably the most iconic record of all time.

WWE: The Undertaker reveals tragedy during WrestleMania

Brothers of Destruction - Wikipedia

WrestleMania 30: Brock Lesnar ends The Undertaker's win streak

When The Undertaker Was Accidentally Set On Fire But Continued To Wrestle Through The Pain

WWE Legend The Undertaker Has Quit Again, But For How Long?

Shawn Michaels and Undertaker: Secret History Behind Feud

18 Most Devastating Moves Of The Undertaker

The Undertaker WWE debut: Which match did The Undertaker make his WWE debut in? (and who won?)

Why did The Undertaker not fight Andre the Giant in his career? What would Andre the Giant think of The Undertaker's love and respect that wrestlers had for him? - Quora

The Undertaker retires from wrestling after a long career delighting fans - The Gauntlet