Stock photography is the supply of photographs, which are often licensed for specific uses. It is used to fulfill the needs of creative assignments instead of hiring a photographer, often for a lower cost. Today, stock images can be presented in searchable online databases. They can be purchased and delivered online. Often, these photographs involve people, and are produced in studios using a wide variety of models posing as professionals, stereotypes, expressing common emotions and gesticulations, or involving pets. Other common stock photography niches include images related to travel and tourism, as well as conceptual photography.