Most people looking this up already know what people pleasing is, they're trying to work out why they agreed to something last week that they had no time for and didn't want to do. It usually isn't dramatic. It's taking the shift nobody else would take, or saying yes to a wedding that runs eleven hundred dollars once the flights are booked, or driving someone to the airport at five in the morning before a full workday.
Understanding where it started doesn't stop it, which is the part people find discouraging. For a lot of women it started at home, where being agreeable was the arrangement and disagreeing had consequences, and then it went with them into work and friendships and marriages, where the same habits get read as being reliable and get rewarded for years.
The posts here are about what it looks like in ordinary situations, agreeing before you've thought about it, apologizing first, keeping a friendship going that only runs one direction, and what tends to happen with the people around you when you stop.
There's the call where someone asks how you're doing, and the other one, the one that only comes when something needs fixing. If you get a lot more of the second kind, this is about the boundary that finally tells you the difference.