The hash function is seen differently by different people. But if you’re questioning what a hash function in cryptography is, it becomes a bit different. The hash function is seen as a unique identifier for any content in cryptography. It processes the plaintext data of all sizes and converts it into a unique ciphertext of a certain length.
In other words, hashing is a mathematical function that gives an output called a hash value of ciphertext or plaintext. It’s a cryptographic technique that transforms your data into a specific text string. Henceforth, once you put a plaintext within a strong hash algorithm, you get the output in a hash value.
Similarly, the hash function is a one-way cryptographic algorithm that maps your input of all the sizes to a unique output of a fixed length in bits. And the resulting output is known as a hash value, hash digest, or hash code which is the resulting unique output.