The leak tag has 1010 questions, most of which are about memory leaks.
The tag-wiki says:
The leak tag refers to a memory leak, which has a very specific meaning with regards to programming.
From the Wikipedia page:
A memory leak, in computer science (or leakage, in this context), occurs when a computer program consumes memory but is unable to release it back to the operating system. In object-oriented programming, a memory leak happens when an object is stored in memory but cannot be accessed by the running code.
Given the fact that there is already a memory-leak tag, with 8104 questions (and a better tag-wiki), this tag seems redundant.