What is the purpose of jockstraps, I cannot see the ones I decided to buy a pack of being practical as underwear?

I wanted to try these because I assumed they was a reason they were being made by some name brands. Ross had some for cheap so I figured I would try them. I think I wasted $8.99.

Updates
10 mo
I guess these type of fashion jockstraps are for gay men. I'm a little conflicted because they are pretty comfortable.
What is the purpose of jockstraps, I cannot see the ones I decided to buy a pack of being practical as underwear?
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