ELI5 White Noise - Plus brown noise, pink noise & other colored noises explained

What is white noise? What about the other colored noises? What do these noises do the brain? Why do some people use brown noise as a way to focus?

... We explain like i'm five!

Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: takedown1001, acheron_apostolos, insecuredud99, wattwattwatt & smithgentleman

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