A design document proposing changes or standards for Bitcoin.
Bitcoin Improvement Proposals (BIPs) standardize processes and propose protocol changes. They include standards for wallets, addresses, and soft/hard fork changes. Well-known BIPs include BIP-32 (HD wallets), BIP-39 (mnemonic seeds), and BIP-84 (Bech32 derivation paths).
All terms and definitions may update as the Cryptionary improves.