They to it to signify if they are playing at their stadium or elsewhere.For example arsenal wears red,white and black when the are at the emirates stadium(home).Yellow and brown when the are at other stadiums(away).
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Soccer teams each have their own specific team uniform colours. Neighbouring high schools will generally have very different colours, e.g. one school red, and one school blue. If there is a clash for one game, then the usual rule is that the visiting team change to their "second" strip, which may be any other colour. A specific league may have a different rule about who switches colours, but it is usually the visiting team so that the home fans (more of them) still sport the right colours.
There is no home and away teams in the super Bowl, only home and away uniforms.
It's possible. All teams would have to win all home or away games and lose all away or home games.
Manchester United have worn red shirts white shorts and black socks since 1928. There is a myth that the black socks were a tribute to the Munich disaster in 1958 but it's not true. The kit is sometimes changed to avoid clashing with the opposing teams colours. The basic rule is that the home team plays in it's preferred kit and the away team changes anything that might make decisions for the officials difficult, sometimes that may be the shirts, the shorts, or just the socks. Most teams nowadays have at least two 'away' kits that are designed to avoid clashes with other teams colours. The match officials have the final say in what each team can wear.
All 30 teams play an equal share of 81 home games and 81 away games.