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A hash function turns any input into a fixed-size string. Same input always gives the same output, but you can't reverse it back. Useful for checksums, password storage (with salt!), and data integrity.
Universally unique identifier. Random 128-bit value used as database primary keys, file names, anywhere you need uniqueness without coordination.
128-bit hash, fast but cryptographically broken. Still fine for non-security checksums (file integrity, deduplication).
NIST-standard secure hashes. SHA-1 is deprecated for security; SHA-256 is what Git, Bitcoin, and TLS use.