Why do sport teams wear uniforms?

In my opinion, there are many reasons that make sport teams wear uniforms.
Firstly, it can easily indicate the team obviously such as football team ; there are 2 teams, the one is yellow and the another is green. You can see who is the member of each team. Furthermore, each member has the number on his shirt because it easy to say about the his performance. For example, if he fouls, the committee will know and manage him or when the broadcaster tells about the match.
Secondly, it is a symbol for each team. So you can distribute and remember it, such as Manchester United, Liverpool and Chelsea. It is the same in basketball too, such as NBA, Houston Rockets and Los Angerles Lakers. Moreover, it can show about the nation too. Those team's fan will know the symbol and cheer them.
Thirdly, many people would like to see and focus on it because some uniforms are creative and beautiful style. It is attractive and popular fashion.
Finally, it is nest and shows the unity. The team or the group will be strong, power and unique. It makes the team work and members work together. So the members will be love together and help each other. All of these is an important result of sport and uniform.