Can somebody please explain Trump to me?

Hi, I’m not American and I don’t live in America. I’ve been seeing Trump around the news and other media for so long. I’ve also seen some of his talks and I’ve observed he’s somehow ignorant… and so stupid… (I’m sorry) but so many people vote for him and I think he’s winning. Just watching him talk about nonsense makes me cringe and worry about America. Why would people vote for him? I don’t understand. Please explain him to me.