Apple has been selling a red version of various products for 15 years now: Not only is it simply a different color, but you also support a good cause with it.
For 15 years now, part of the proceeds from the sale has gone to a project against AIDS (and recently also against Corona). Apple claims to have supported 13.8 million people with HIV infection with this campaign. Up to 270 million dollars have been collected since the beginning of the project. More information can be found here.
If you want to do something good you can also donate directly to the project – or buy one of the (RED) products right away if you like the bright color anyway. On this special page Apple lists all currently available products.