Paths in Ruby Rack

Well I'm glad you asked, hypothetical person from the internet. Paths are, as the name suggests, the roads through which information travels to and from a server. If a user wants to ask a database how many cats there are in the universe, then they are routed through a path, so that the server knows what they are asking for and from where, and therefore, how to react to that request. After all, showing someone a cat and letting someone post a picture of a cat are two very different things. So, what are some different paths and routes you can take?.