It's kind of a vote of no confidence that then requires the US Senate to hold a "trial" on whether to remove. Essentially, the House (a more general populace representative body) says "he is bad and should be reviewed'. Then the Senate (which more represents the states, not the public) decides whether to agree and then a removal happens if they do.

Otherwise? It's just the Senate saying "he's fine and we're okay with it", which is what the Republicans are. They're okay with crime and hatred of fellow Americans as long as it's their people doing the hating and criming.