A museum (// mew-ZEE-əm; plural museums or, rarely, musea) is an institution that cares for 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 the conservation and documentation of their collection, serving researchers and specialists to catering to the general public. The goal of serving researchers is not only scientific, but intended to serve the general public.
There are many types of museums, including art museums, natural history museums, science museums, war museums, and children's museums. The world's largest and most visited museums include the Louvre in Paris, the Metropolitan Museum of Art in New York City, the National Museum of China in Beijing, the Smithsonian Institution in Washington, D.C., the British Museum and National Gallery in London, and the Vatican Museums in Vatican City. According to the International Council of Museums (ICOM), there are more than 55,000 museums in 202 countries.