What is a projectile?
An object launched into the sky and allowed to continue it's flight influenced only by gravity and it's own inertia is a projectile. On the moon, where there is no atmosphere, anything we launch into the sky is a projectile. There is no atmosphere on the moon to exert aerodynamic forces on a moving object.
The atmosphere on Earth changes things a bit. When something is moving relative to the surrounding atmosphere there is an aerodynamic force on the object.
The Path of a Projectile
The path of a projectile is characterized by: