I am surprised that they still make pressue cookers since we now have crock pots.
There’s a huge difference. A pressure cooker speeds cooking by allowing steam that’s under pressure to build temperatures over 212 deg. F to much larger levels. A crock pot, OTOH, is a slow cooker that works at low heat and usually takes twice as long to cook a stew, for example, as cooking the same stew on a stove would. The vessel of a pressure cooker is also designed to withstand high pressures while the vesssel of a crock pot is not.
I remember my mother had one and used it to cook spinach, of all things.
Recently a Brazilian friend staying with me wanted to use one to cook beans and since I didn't have one I asked around my neighborhood to borrow one but none of my neighbors had one. After that I bought one from Walmart but I've never used it. I do make Brazilian beans but I use can beans which are just as good.
Brazilians use pressure cookers because the cooking time is half the time as cooking them in a regular pot on the stove.
When I was in Portugal some Brazilians living there told me that pressure cookers are illegal there.