Importance of Various Body Building Supplements

I often hear people suggesting different body building supplements to each other in order to look attractive, but after hearing them, I often wonder, do they really need to spend money on these supplement just to keep them fit. Another question that pops in my mind, when I hear about these supplements is whether these supplements really work? And are they the only way to keep our body in a perfect shape. So to search for these answers, I started searching the internet for the importance of various body building supplements and their affect on the body for keeping it fit.