Force is a fundamental concept in physics that represents a push or pull on an object, which can cause that object to move, change its motion, or deform. It is a vector quantity, which means it has both magnitude and direction. In other words, it's not just about how hard you push but also in which direction you push.

The unit of force in the International System of Units (SI) is the newton, represented by the symbol "N." One newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared (1 N = 1 kg·m/s²).