The incendiary grenade is a type of tactical grenade that is used to set an area on fire which inflicts damage to players if they are in the affected area. In addition, the incendiary grenade can be effective against gas clouds and goo as it ignites and dissipates them quickly.
The incendiary grenade can be extinguished by someone throwing a Smoke Grenade at it.
Cautionary Note
It will do damage to you and your teammates so be careful where you throw it.