A business directory is a free, online directory that provides business owners with the ability to create a profile for their company. The profile includes basic information about the business, such as the name, address, and phone number. In addition, business directories can also include additional information about the company, such as the products or services offered, website URL, and hours of operation. Business directories are a great way to increase visibility for your plumbing company. They are, therefore, an essential part of local search engine optimization.