The book of Revelation foretells that at the time of the end, in the last few years of Satan's dominion over the earth, a religious personality will arise and deceive the whole world by means of miraculous signs. This individual is referred to as "another beast" (Revelation 13:11), as well as "the false prophet" (Revelation 16:13; 19:20; 20:10). The False Prophet is given supernatural power to do things like calling fire down from heaven (Revelation 13:13), and the signs he performs, combined with the demonic words he speaks (Revelation 16:13-14), will cause people to give their allegiance to - and even worship - the Beast (Revelation 13:14). This man will wield tremendous religious influence, and inspired by the Dragon, he will successfully convince most of the world to commit idolatry (Revelation 13:12).
The Bible does not reveal the False Prophet's name or even the number of his name, as it does for the Beast. Instead, we will have to recognize him by his fruits - by what he says and does (Matthew 7:15-20). Yet, even this is a tricky proposition. For instance, the False Prophet will be able to call down fire from heaven, and yet Elijah, a true prophet of God, did the same (I Kings 18:36-38). If we see a man calling fire down from heaven, how do we know whether he is true or false?
The end time is prophesied to be full of deceptions (Matthew 24:11), and the elect will not be totally immune to having the wool pulled over their eyes (Matthew 24:24; Mark 13:22). It will take careful evaluation to see through the façade and to recognize Satan's servants for what they are, rather than what they appear to be (II Corinthians 11:14-15).
The details given about the False Prophet are few. However, if we understand the patterns and motivations that the Bible reveals about the class of people called "false prophets," we will be better equipped to recognize the general mold that the end-time False Prophet will fit.