Most of these scams involve either getting your personal information so they can steal your identity and use it for more scamming, or just straight up telling you to send money for one reason or another.
This one time about 10 years ago I got a call from a guy with an obvious Indian accent, but at that time India was not yet known for scamming. He told me that I had won a prize in a draw, and the thing is that a few weeks before that I actually did fill out a form for some draw in a bar so I thought it was for real. He said I won a cruise trip for two, but I said I wasn’t interested in a cruise, he replied that this was just the main prize they were offering and there were other trips as well and I could go to Las Vegas, Mexico, Dominican Republic, and so on. He said he just needed to confirm my personal information, I said no problem. He then said “I will just need to put you on hold for a moment. My name is Brian Smith.” Aside from the awkwardness of suddenly telling me his name like that, there was no fucking way his name was Brian Smith. I hung up right there, but I almost got scammed.