Memory leak
From GDWiki
A memory leak is a part of the systems RAM memory that isn't released properly. This is a common problem in software development.
Usually a piece of memory is allocated to store data, but isn't released when the data isn't used any more thus causing a "leak". The size of this leak is dependant on the size of the memory allocated.
Most of the time such a leak isn't severe enough to cause the application or system to become unstable. But if memory is leaking each frame in a game, for instance, then it quickly becomes a critical problem and is likely to crash the game after a period of time. Therefore it is very important to be aware of when memory is allocated, and to make absolutely sure that it is released again when it is no longer used.
