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Like hearing but with color.
No, seriously, it's impossible to accurately convey. You can talk about the mechanics, the use cases, what you can do with it, but you cannot convey "how it is", same as a bat cannot convey "how sonar is".
Only good answer, really - can only answer in the terms of other senses, however, since colour is meaningless too: "It's like being able to hear the texture of things, even at a great distance."
It really is, which is why I find videos like "Kids explain color to blind people" (which is an actual video that exists btw, it's the dumbest thing I've ever seen out of a clickbaity video trying to be smart, and one kid is even like "so you know what an apple looks like right?" or something) so dumb.