Sony has released a new video that explains how the PlayStation 4's "Share Play" feature will work.

The function was designed to work as a "virtual couch", said Sony. Players will be able to create a co-op play session and hand over control of the game remotely to a friend without that friend having to own or download the game.

In the event that a friend does not own the game being shared, Share Play play-time will be limited to one hour.

Share Play features:

Share Screen: Share your screen with a friend, allowing them to spectate. This is ideal for PS4 owners that want to watch their friends play a game and provide helpful tips. PlayStation Plus is not required to use this.
Hand over my controller: Pass your controller to a friend, virtually, and watch them play. Your friend does not need to own, or even download the game, in order to use this feature. This is perfect for introducing your friends to new games. The host will need to be a PlayStation Plus member, but the guest does not.
Hand over another controller: If a game supports local multiplayer, you can have your friend join as player two. Again, the visitor does not need to own, or download the game in order to use this feature. Both players will need PlayStation Plus to use this feature.

Share Play is coming in the PlayStation system update 2.00.