It's hard to explain in my own words what they are. I'd rather give you a link to an article that talks about it in detail. I think, after reading it, you will understand much better what reverse proxies are, what are their features, advantages and what are their disadvantages https://proxy-best.com/proxy-guide/what-is-a-reverse-proxy/.

I would like to know more about what reverse proxies are, how they work and what are their advantages as opposed to simple proxies? Who has used such proxies, what can you say about them?