Large National Chains include Premier Inn, Ibis and Travelodge, but for a similar price and something with character there are other local or smaller options, see the link.
It is where there is a bunch of hotels under the same name, like Motel 6, or something like that, and there are a lot of them, so it is kind of like a chain. It is kind of like McDonald's - how there...
This is a very difficult question to answer because the hotel chains with the most hotels are not necessarily chains in the correct sense of the word. For example, Best Western has over 4,000 hotels...