Thomas Edison undertook major projects that shaped the development of electrical technologies, including the invention of the practical electric light bulb and the founding of General Electric. His establishment of the first industrial research laboratory allowed for the systematic development of new inventions. Edison’s innovations, like the phonograph and improvements in telegraphy, revolutionized communication and entertainment. His work paved the way for the widespread use of electricity, fundamentally transforming modern society and industry. Edison's contributions solidified his legacy as one of the greatest inventors in history.