A file extension is the characters after the last dot in a file name. For example, in the file name winmail.dat, the file extension is dat. It helps Windows select the right program to open the file.
Margin is borrowing money from your broker to buy a stock and using your investment as collateral. Investors generally use margin to increase their purchasing power so that they can own more stock without fully paying for it.But margin exposes investors to the potential for higher losses.ut if you bought the stock on margin  paying $25 in cash and borrowing $25 from your broker  you'll earn a 100 percent return on the money you invested. Of course, you'll still owe your firm $25 plus interest.
The deposit is held by the clearing organization of the exchange. (2) in stock transactions, margin refers to the down payment required when borrowing from a broker to finance the purchase of stock. Answer Margin is borrowing money to buy securities. The upside of margin is it amplifies gains. The downside is it amplifies losses.