Three strings that look “roughly like access” in the UI. They are not the same thing.

Address

Public. On Ethereum and most EVM chains — 0x plus 40 hex characters. On Solana — Base58. On TON — EQ… / UQ….

You can give it out for payment, paste it into a tracker, put it in a profile. You cannot recover a seed from an address. You can see how much sits on it: the network is public.

Private key

One long string for a specific address. It signs spends. Exporting a “private key” from a wallet is almost like handing over the seed, but for one branch, not the whole set of addresses. It does not go in a chat. It does not go in a website.

Seed phrase

12 or 24 words. From it come many addresses and keys. That is the whole wallet, every chain inside that phrase. See why the seed stays secret.

App password / PIN

Protection for this MetaMask install or this phone. Forgot the password, still have the seed — you restore. Lost the seed, remember the password — in a month you change phones and have nothing.

Crypto360 asks only for an address (and a read-only exchange key). If a service asks for a seed “to show the balance”, close the tab.