Economy, business or first class?

i've always been on economy class whenever i travel. i find it okay as long as i am comfortable. i just needed a safe and faster way to reach my destinations. but if i have to travel for hours in a plane, i'd like to try travelling in first class. i'm just curious with what's in first class that is not available in economy.

I'm not a businessman though i've working hard to achieve that status. i often take commercial flight and the interesting thing is that i almost land on every airport that people get off and i've sometime to walk and look around the airport.