Intellectual property refers to original creations such as inventions, literary and artistic works, and symbols, names and images used in commerce that are protected by law from unauthorized use by others. There are two main categories of intellectual property: industrial property, which includes inventions, trademarks and industrial designs; and copyright, which includes literary and artistic works such as novels, poems, plays, films, musical works, artistic works such as drawings, paintings, photographs and sculptures, and architectural designs. The World Intellectual Property Organization (WIPO) is a United Nations agency that oversees international intellectual property laws and treaties.