Uniforms refer to the clothes worn by a group of people in the same group, which are used to identify members of various occupations or different groups, such as students, soldiers, doctors, nurses, policemen and other people who often wear uniforms.

In the early days of human civilization, clergy like religion have begun to wear a system to show their identity. Until now, some religious clergy (such as Buddhism and Catholicism) still wear special clothes to show their identity.

Some professional uniforms are uniform all over the world, such as airplane pilot uniforms and navy uniforms.

Schools in some places, such as some countries in Asia, require students to wear school uniforms.