Address
A public identifier derived from a key pair that can receive coins or tokens on a blockchain.
An address is what you share to be paid. It is derived from a public key by hashing and encoding, so it reveals nothing about the private key that controls it. Formats differ by chain: Bitcoin addresses begin with 1, 3 or bc1; Ethereum and other EVM chains use 42-character hexadecimal strings beginning 0x; Solana uses base-58 strings.
Sending to an address on the wrong chain, or to a mistyped address, is usually unrecoverable. Every balance and every transaction touching an address is public, which is what makes on-chain analysis possible.