Small businesses in many countries include service or retail operations such as convenience stores, small grocery stores, bakeries or delicatessens, hairdressers or tradespeople (e.g., carpenters, electricians), restaurants, guest houses, photographers, very small-scale manufacturing, and Internet-related businesses such as web design and computer programming. Some professionals operate as small businesses, such as lawyers, accountants, dentists, and medical doctors (although these professionals can also work for large organizations or companies). Small businesses vary a great deal in terms of size, revenues, and regulatory authorization, both within a country and from country to country.