Player-to-player trading will open up as soon as Bungie is able to enable it, but until then you’ll only be able to trade items between your own characters.
For more on Destiny, check out our latest written impressions, the video preview above, and the IGN wiki. Mitch Dyer is an associate editor at IGN. He's trying to read 50 books in 2014. These are the 50. Talk to Mitch about books and other stuff on Twitter at @MitchyD and subscribe to MitchyD on Twitch.