Bitcoin - differences between address, account and wallet I've been reading official BTC documentation and now I'm completely lost. Documentations is too tangled and written in unnecessary many words.
They have:

https://en.bitcoin.it/wiki/Address

https://en.bitcoin.it/wiki/Accounts_explained (no, actually not explained)

https://en.bitcoin.it/wiki/Wallet

Please, somebody tell me the difference between them in a simple manner. What's an address, an account, a wallet, and how does the keys fit in.
"Accounts" are a concept limited to bitcoin-qt, and it's probably better to forget about them entirely.

Each address has a corresponding private key, that you use to move bitcoin out of that address. A wallet is simply a collection of (address, address_key) pairs.

Some people also use the term "wallet" to refer to the software that implements the wallet functionality.



Obviously, this is a grossly simplified answer, and not strictly true, but useful if you just want to understand bitcoin superficially.