Tourism is, beyond question, Niagara-on-the-Lake's main industry, as the number of sites related to it shows. Even then, the weight falls most heavily on the Lodging category and the five subcategories that provide details of the numerous places where visitors can stay overnight. The one dealing with hotels and the four describing the Bed and Breakfast houses each have their own Category Descriptions. Their intention is to reduce, if only arbitrarily, so extensive a selection down to a manageable set of choices.