A pub chain is a group of pubs or bars operating under a unified brand image. Pubs within a chain are tied houses and can, generally, only sell products which the chain owner sanctions. Pubs in a chain normally display their chain branding prominently and may also feature shared aspects, such as menus and staff uniforms. The owner is often called a pubco and the chain may exist as a single operation or it may be a division of a larger company, such as a brewery.