Grenade launchers in Destiny 2 are a type of heavy weapon that launches explosive grenade in an arc toward a target. They are typically slow to fire, but have high damage output, making them effective against enemy shields, bosses and other tough targets. Different grenade launchers have different types of grenades, such as sticky bombs, proximity mines, and tracking rounds, allowing for different play styles and strategies.
Grenade launchers can be used as heavy weapons but there are also some lower-damage launchers that can be used as one of your primary weapons. These launchers are faster to fire and reload but do considerably less damage when compared to heavy weapons.