The physicist Nikola Tesla was a Serbian-American inventor, electrical engineer, and futurist who made groundbreaking contributions to the development of modern technology. He is best known for his work in the field of electricity, particularly his invention of alternating current (AC) power systems. His name is often associated with the Tesla coil, an early form of wireless communication. Tesla's inventions revolutionized the way electricity is used and distributed, and he is credited with helping to usher in the modern age of electricity.