Rehashing is the process of resizing a hash table and redistributing its entries into a new hash table with a different size, usually triggered when the load factor exceeds a certain threshold. This technique is essential to maintain efficient operations within a hash table, such as insertions, deletions, and lookups, by ensuring that the number of collisions remains manageable. As the dataset grows or shrinks, rehashing optimizes the performance of both the hash function and collision resolution techniques.
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