There are 6 types of grenade in the game.
To throw a grenade press left on the d-pad to select it and then the right trigger (fire button) to throw it.
While selected, a throw path is shown on the hud to indicate where it will land.
To select the different types of grenade hold down left on the d-pad to bring up a selection wheel then select the type of grenade you need. If you have any available.
Fragmentation grenades are high damage explosives
Incendiary grenades has a chance to burn any enemy caught in the blast. Burn will drain the enemies health over time.
EMP grenades will destroy any active Skills caught in the blast. EMP grenades also prevent the affected enemies from deploying any new skills for a period of time.
Flashbang Grenades will temporarily impair the vision and hearing of any enemy caught in the blast.
Shock grenades will temporarily paralyze any enemy caught in the blast and also deal damage.
Tear Gas Grenades will temporarily impair the vision, as well as the accuracy, of any enemy caught in the blast.