Plexippus paykulli is a jumping spider in the family Salticidae.
It is native to south east Asia but has spread to other parts of the world.
In the United States, it is called the Pantropical Jumping Spider.
It is usually associated with buildings and may be found near light sources catching insects attracted by the light.
The female is slightly larger than the male, ♀ 10mm; ♂ 9mm.
The sexes are easy to tell apart as the males have a black back and abdomen with a broad white central stripe, another broad white stripe on either side and a pair of white spots near the posterior end of the abdomen. 
The female is overall brownish grey with a light brownish stripe on her back.

A male. Anhinga Trail, Everglades National Park, Florida, USA, 25 November 2012