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SHA-256 stands for Secure Hash Algorithm 256-bit and it’s used for generating a cryptographic hash.It was designed by the National Security Agency (NSA) in the United States. SHA-256 is a one-way mathematical function that takes an input (or message) and produces a fixed-size string of characters, typically 256 bits long. SHA-256 owes its popularity because of its ability to create a non reversible hash i.e. if you have its result, you should never be able to reverse it back to the input. It’s considered cryptographically secure, meaning it’s computationally infeasible to reverse the process and retrieve the original input from its hash value.
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