A museum is an institution that cares for (conserves) a collection of artifacts and other objects of artistic, cultural, historical, or scientific importance. Many public museums make these items available for public viewing through exhibits that may be permanent or temporary. The largest museums are located in major cities throughout the world, while thousands of local museums exist in smaller cities, towns and rural areas. Museums have varying aims, ranging from serving researchers and specialists to serving the general public. The goal of serving researchers is increasingly shifting to serving the general public.
There are many types of museums, including art museums, natural history museums, science museums, war museums, and children's museums. Amongst the world's largest and most visited museums are the Louvre in Paris, the National Museum of China in Beijing, the Smithsonian Institution in Washington, D.C., the British Museum in London, the National Gallery in London, and Metropolitan Museum of Art in New York City.
As of the 2010s, the continuing acceleration in the digitization of information, combined with the increasing capacity of digital information storage, is causing the traditional model of museums (i.e. as static bricks-and-mortar "collections of collections" of three-dimensional specimens and artifacts) to expand to include virtual exhibits and high-resolution images of their collections that patrons can peruse, study, and explore from any place with Internet. According to The World Museum Community, there are more than 55,000 museums in 202 countries.