MD5, SHA-1, SHA-2 and SHA-3 digests, several algorithms at once
Digests appear once you type something
MD5 and SHA-1 have known collision attacks. Fine for checksums, never for passwords or signatures.
No. MD5 and SHA-1 are collision-prone and fast to brute force; store passwords with slow hashes like bcrypt, scrypt or Argon2. MD5 is fine only for non-security checksums.
A hash is a one-way fingerprint used for integrity checks and deduplication; encryption is reversible and needs a key to recover the original.