Elves are beautiful, immortal, wise and powerful. They have a connection to nature that human-kind cannot begin to understand. They are strong allies and potent enemies. These beings have been written about since medieval times. In the older writings, they were blamed for causing sickness and generally wreaking havoc. In the newer, more current works, they are certainly portrayed as arrogant and mighty, but rarely purposefully cruel or vicious.
You can find them in many stories, including some of my favorites: the Shannara series by Terry Brooks and, of course, the writings of Tolkien. You can also meet a wonderful dark elf (also known as a drow) named Drizzt in the Legend of Drizzt series by R.A. Salvatore.