whats a sugar mommy? (female reader x older woman)

it all started with a dating ad coming up on your phone. You would usually close such things, but recently, your friend Cara has been encouraging you to find someone. you don't see the harm in it and decide to download one. after a while of swiping left, you start to get bored. just as you were about to close the app, this woman piques your interest... she was older than you but she was beautiful. her bio was interesting to you. it all looked normal till you saw the words sugar mommy in her bio. what was that you thought as you swiped right