If we look back at our Tower component in the inspector, you'll notice that a prefab named bullet is assigned to the projectile variable. This prefab can be found in the Prefabs folder of the sample project. The prefab looks similar to the following screenshot:
The bullet prefab
The bullet game object is nothing fancy; it's just a bright yellow orb. There is a sphere collider attached to it, and, once again, we must make sure that IsTrigger is set to true and it has a Rigidbody (with gravity turned off) attached to it. We also have a Projectile component attached to the bullet prefab. This handles the collision logic. ...
