What are the no kings protests?

I'm from the UK, and for you Americans out there: what is the purpose of the no kings protests? I believe in the freedom of speech and exprssion and a fundamental part of that is freedom to protest, and so I'm not against protests at all, but what is everyone protesting for? Ik trump is mostly disliked, but your country is still a democracy, even if a flawed one. But it's been flawed for decades, it's not like trump has ruined absolutely everything. So what are the protests about?