Margin : The fixed price at which both buyer and seller agreed to execute the contract in future(future contract)
MTM : Mark to market. In both future and option contract , the ledger balance is neutralized by exchange. Premium is the amount which is given by buyer to seller for accepting the contract.The price mentioned in the option contract is called strike price. The settlement day of both future and option contract is expiry date. Both the future and option contract is executed in lot size (bulk shares). Lot size is varies based on the company.