I've seen there are margin options up to 4x on binance too (so you can lend 4x more than your balance and releverage from there).
But you can get even up to 150x on BTCUSDT pair.
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Derivates are just some coin/token/security which price is reliant on the price of other asses or more of them. It will be like new Facebooks (stable)coin Libra which price will be deducted from some fiat currencies.
Yeah I forgot to include the futures part that is up to 125x on binance (it's a bit different from margin though as margin is like an active loan against collateral rather than a futures contract - for example you can't short in binance margin like you can in binance futures afaik).