In the late 1800s, a spelling-reform movement was led by Noah Webster. This was the beginning of an attempt to introduce more "phonetic" spelling into American English. The movement continued through the first half of the 20th century. Noah Webster and his successors were able to introduce a number of uniquely American spellings to varying degrees of success. Some changes stuck, such as "color" and "neighbor". Others didn't. We still use "engine" instead of "engin"; and "rough" instead of "ruf."

Colour is British English while color is the American way.

Hey Kuniklo! ^-^ They both mean the same thing. they are just spelled different. In America, we often use "color" instead of "colour." "Colour" is kind of old English type of word.

the meaning is the same... BUT Colour: is the standard spelling. Color: is the US (American) spelling.

Canadians also spell it "colour." There are several other words spelled differently in England and the US, such as honor (honour).