If you're referring to dota:
Pick hero - you can pick one of any hero (regular mode is limited to your alliance: sentinal/scourge)
Random draft - a bunch of random heroes are put into a pool, and players take turns choosing a hero of those
Single draft - every player gets a pool of 3 private heroes (one of each attribute), and chooses one of them
But yeah...wrong place
The third one is similar to what I remember seeing in HoN.
That would because HoN is based on DotA, which had the mode before it was released..