What is a bloom filter?

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What is a bloom filter?

A bloom filter is a probabilistic data structure that is used to test whether an element is a member of a set. It uses a bit array and a set of hash functions to efficiently store and query data. The main advantage of a bloom filter is its space efficiency, as it can represent a large set of elements using a relatively small amount of memory. However, there is a small probability of false positives, meaning that it may incorrectly indicate that an element is a member of the set even if it is not.