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A memory leak is when your computer forgets something it should remember. It happens when a program uses too much of the computer's memory and doesn't free it up afterwards. This means the computer will eventually run out of memory and start to slow down or crash. The best way to prevent memory leaks is to make sure you have the latest updates for the programs and games you're using. Doing this will help make sure your computer doesn't run out of memory and won't have to struggle.