What is a collision and can it be eliminated?

A collision is a situation where different data (for example, different keys) produce the same hash value when hashed. In Python, this often occurs in dictionaries, where different objects can have the same hash.

It is impossible to completely eliminate collisions, as the key space is usually larger than the hash space (limited by the size of the hash table). However, collisions can be effectively handled, for example, using chaining (linked lists) or open addressing.

Example: In a Python dictionary, when a collision occurs, elements with the same hash are stored in a linked list or another structure, which allows for correct retrieval of the desired element.