Basically what the title asks.
All the other colors of the rainbow are either primary or secondary. Violet is a shade of purple and (as I’ve always understood it) indigo is somewhere between navy and purple.
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We didn’t always have a separate name for some colors like orange and purple. That’s why “roses are red, violets are blue”. When they were naming the colors of the rainbow, they described the higher-energy “blue” as being the color of a violet.
It’s all kind of arbitrary anyway, the rainbow is a continuous spectrum of wavelengths, it’s only our eyes and our brain that compartmentalize it into a handful of distinct basic colors
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