Swap, is a secondary (disk-based) storage for your RAM: The main purpose of this secondary storage is to avoid server crashes having to do with the memory.
The way it accomplishes this is by storing any unused memory from applications (that heavily consume memory) into this secondary disk storage. The reason it's called the swap is that it will swap out the memory it needs when it needs it and swap it with unused memory. (This unused memory is swapped on the basis that the memory will not be needed in the near-future)
Swapping is really slow so it is recommended NOT to rely on it. It is best to ensure that your applications are using the least amount of memory possible.
Solutions:
Make your Applications consume less memory
Search Knowledge Base Articles
Swap Usage - WHM
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