A Polo shirt is much more dressed up which differentiates it from the normal Tee-shirt and is currently dominated by bright shades. It is also most favoured because of the collar which you can pop up or leave down.
Style Tip: Pair a polo shirt with tailored shorts for a casual look and slacks for a more mature dressed up look. Pop your collar for the cool edge.
Once you know your way around it, you can wear it in countless different styles.