Yes, but with big wins come big losses.
Yes and you have to trade with margin in forex unless you are trading $100,000 plus accounts So the minium trade on a mirco lot (.01 lot) is $1000 USD for the EURUSD. Without margin you would need $1000 dollars to make the trade. At margin of 100:1 you can trade the minium at say $10 dollars. ( I hope I got my math correct, I still get mixed-up) In USA, the max margin is 50:1, so you need $20 to place the trade for a $1000 (.01 lot). Most forex trading done to move money around the world is done in lots. A lot is $100,000 USD or for some brokers a lot is 1 million.
In the stock market, margin is barrowing money more than you have. Normally a max of 2x you account size and if the trade goes against you, you get a margin call and they sell your position for a loss. Margin calls happen in forex all the time too.
With quesiton this basic, you should look for a good forex book. Also, lots of info here and on babypips.
Just get a demo account with 100 or 50 margin, do some trades and you will see.