Warning: What you're about to read is a bunch of nonsense. Don't try to use this information to solve any real-world quantum problems. You'll just end up confusing yourself.
A White Hole is a theoretical region of space-time that's like the opposite of a Black Hole, but less cool. It's like a cosmic sinkhole that sucks up all the fun.
Don't even get us started on the implications of White Holes on the grand tapestry of space-time.