When should I use the Visitor Design Pattern? [closed]

I keep seeing references to the visitor pattern in blogs but I’ve got to admit, I just don’t get it. I read the wikipedia article for the pattern and I understand its mechanics but I’m still confused as to when I’d use it.

As someone who just recently really got the decorator pattern and is now seeing uses for it absolutely everywhere I’d like to be able to really understand intuitively this seemingly handy pattern as well.

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