The electricity

For me, the most important invention is electricity.
Tomas Alva Edison made the first incandescent lamp in 1879, and then it was very successful.
If you just think a little you can imagine that TV, mobile phones, computers, light in our houses and those things wouldn't exist without electricity.
I'm completely sure that we couldn't live without electricity, that's why I think that it's one of the most important inventions ever.