Nikola Tesla was a Serbian-American inventor and electrical engineer who made significant contributions to the development of modern electricity and radio technology. He was born in Croatia in 1856 and immigrated to the United States in 1884. Tesla is best known for his work on alternating current (AC), which is the type of electricity that is used in most homes and businesses today. He was also a pioneer in the field of radio, and he developed the Tesla coil, which is a type of high-voltage transformer that is used in radio transmitters and other electrical devices. Tesla died in New York City in 1943.