future call put

Hi sir,
This will be the appropriate answer for the question What are Margin / MTM / Premium / Strike Price / Expiry Date / lot size?:
Margin – The Refundable deposit amount paid to exchange by both buyer and seller as a caution deposit.
MTM (Mark to Market) – According the prize variations in the market the ledger balance will be neutralized to the buyers & sellers till the expiry date of the contract.
Premium – The money paid to option seller of the contract for signing the option contract.
Strike Price- The price at which the contract is signed.
Expiry Date – End date of the contract i.e. The maturity date or the validity date mentioned in the contract.
Lot size – Number of shared covered in the contract or the minimum amount of shares
Note: In contracts shares should be bought or sold in lots.