Hi, I,m building a website about food and restaurants and I want to let each visitor rate the restaurants in my list from one to five. How do I do that? Thanks.
What have your Google searches and inspecting existing sites that have user ratings shown you?
Yours is an open ended question that is not deserving of an answer until you’ve expanded your own knowledge base to the point of having more specific questions. So, do a little research, and bring those bits that you don’t quite grasp back for more guidance.
cheers,
gary
Hint to expand on the curmudgeon’s comment 
You’ll do well hunting for Ajax-based plugins.