Im new to Forex, and i have a couple of questions for you guys if you dont mind...I warn you, im new to this 
1)--Im having trouble understanding the pairs. Lets say, USD/JPY. Now lets say i buy 100 units when its low...What am i buying? am i buying USD? And, when i see something like USD/JPY on my graphs, and the graphs shows its way down, i buy, what what am i buying?
2)--What do the units mean?
When you guys buy, what has to happen in order for you to buy?
Thanx guys

1)--Im having trouble understanding the pairs. Lets say, USD/JPY. Now lets say i buy 100 units when its low...What am i buying? am i buying USD? And, when i see something like USD/JPY on my graphs, and the graphs shows its way down, i buy, what what am i buying?
2)--What do the units mean?
When you guys buy, what has to happen in order for you to buy?
Thanx guys