On Solana, a token is defined by its mint account, which stores supply, decimals and optional authorities. A user's balance lives in a separate token account.
SOL is the native asset for network fees. SPL tokens operate through a token program, so wallet, mint and token-account addresses represent different objects.
A token can use the original Token Program or Token-2022 with extensions. Inspect the program and extensions because they can change transfer behavior and authority.