Thomas Edison is credited with many important inventions, including the phonograph, the practical electric light bulb, and the motion picture camera. However, his best invention is a contentious topic and often depends on personal opinion. Some experts and historians consider the electric light bulb to be Edison's most significant invention, as it revolutionized lighting technology and had a profound impact on society. Others argue that the phonograph was his greatest achievement, as it marked the beginning of the recording industry. Still, some believe that the motion picture camera was his most influential invention, as it laid the foundation for the film industry. Ultimately, the choice of Edison's best invention is subjective and can vary based on different criteria and perspectives.