What is the closest star to the earth?

Strictly speaking, the CLOSEST star to the Earth is our own Sun. The next closest after that is Proxima Centauri, a tiny red dwarf 4.2 light years away. Even though it is the closest star to the Sun, it cannot be seen by the naked eye, because it is too dim!
The sun. It's a medium-sized star.
Technically the sun is the star closest to the Earth, but because we experience it so differently from the other stars, we do not normally think of it as such. The closest star to us aside from the sun is Proxima, a small star that is part of the Alpha Centauri star system. On average, Proxima is 4.22 light years away while the star system as a whole is 4.27 light years away.
The Sun is technically the closest star to the Earth. Besides that though, the star Alpha Centauri is closest. It is approximately 4.37 light years away
The star closest to earth is the sun, averaging 93 million miles over the course of

one full year.

After the sun, the next nearest star is Proxima Centauri, roughly 270 thousand times

farther from us than the sun is.