http://www.newsweek.com/why-mars-called-red-planet-what-atmosphere-made-1578072

Mars is popularly known as the Red Planet because of its distinct rusty color. The planet's color can even be seen with the naked eye from Earth, appearing in the night sky as though it were a red star.

Data from Google Trends show people are curious as to how the planet got its redness. The recent searches may be to do with a viral conspiracy theory on TikTok that falsely claimed Mars is red because humans destroyed the planet in a nuclear war.