By definition, projectile motion is the motion under the influence of only one force--gravity. In other words, only one force acts on a body that is undergoing projectile motion and it is the gravity. Thus, if we were to draw a free-body diagram of a body undergoing projectile motion, only one force will be drawn on it and it will have a downward direction (since gravity acts downwards and is the pull of the planet Earth on the body). Note that the body may be traveling in the upwards direction or downwards direction, the only force will still be gravity.
Projectile motion is a motion in 2-dimensions, x and y. Thus, a baseball thrown by a pitcher or hit by the hitter undergoes projectile motion. Similarly, projectile motion can be observed in basketball. A bullet fired from a gun, also undergoes projectile motion.
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