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A hash is a fixed-length string generated from input data using a mathematical algorithm. The same input always produces the same hash. Even a tiny change in input produces a completely different hash. Hashes are used for data integrity, password storage, and digital signatures.
For security purposes, use SHA-256 or SHA-512. MD5 and SHA-1 are no longer considered secure for cryptographic purposes but are still useful for checksums and non-security applications.
No. Hash functions are one-way — you cannot reverse a hash to get the original input. This is what makes them useful for password storage.