There have been many important inventions that have had a significant impact on mankind between the discovery of electricity and the invention of computers. It's difficult to say which one is the "best" as each of them had their own unique contributions. However, some inventions that could be considered among the most important are:
1. The telephone: Invented by Alexander Graham Bell in 1876, the telephone revolutionized communication by allowing people to speak directly with each other over long distances.
2. The automobile: Invented by Karl Benz in 1885, the automobile has had a profound impact on transportation, allowing people to travel more quickly and easily than ever before.
3. The airplane: Invented by the Wright brothers in 1903, the airplane completely revolutionized travel and transportation by making it possible to travel long distances quickly and efficiently.
4. The radio: Invented by Guglielmo Marconi in the late 19th century, the radio made it possible to transmit information and entertainment over long distances, revolutionizing communication and entertainment.
5. The light bulb: Invented by Thomas Edison in 1879, the light bulb made it possible to work and play long after the sun had set, transforming the way we live our lives.
Overall, each of these inventions had a profound impact on mankind, helping to shape the world we live in today.