The closest star to the Earth other than the sun is Proxima Centauri, which is part of the Alpha Centauri triple star system. Proxima is 4.22 light years from Earth, which is 271,000 times the distance from the Earth to the sun.
Proxima is a red dwarf star that is found in the constellation Centaurus. It is smaller than the sun and has one eighth of its mass. However, Proxima is 40 times more dense than the sun. As of 2015, no planets have been found that orbit this star.
Normally, Proxima is a dim star that can't be seen with the naked eye. However, it is also a flare star and experiences spikes in brightness now and then.