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Python's Garbage Collector is an automatic memory management mechanism that frees memory occupied by objects that are no longer used by the program.

Python uses several methods for this:

1. Reference counting — each object has a reference count, which increases when a new reference to the object is created and decreases when a reference is deleted. When the count reaches zero, the object is immediately deleted.

2. Cycle collector — reference counting cannot free objects that refer to each other (cycles). For such cases, Python runs an additional cycle collector that periodically searches for and removes these cycles.

Thus, the garbage collector helps prevent memory leaks and relieves the programmer from manually managing memory.