It's colourful, not colorful.
It's colours, not colors.
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It's actually both, depending on the region :) "Colorful" and "colors" are US spelling, and more people speak US english than brittish, so I tried to not trigger the larger segment :)))) I personally use the brittish spelling, usually. Also, I am not a native speaker, so I never know which spelling to use, in what context :)