Final answer:
According to Newton's third law, every force has one and only one reaction force, which is equal in magnitude but opposite in direction.
Step-by-step explanation:
According to Newton's third law, every force has one and only one reaction force. This means that for every action force, there is an equal and opposite reaction force. The action and reaction forces always have the same magnitude but act in opposite directions. For example, if you push a table with a certain force, the table pushes back on you with an equal amount of force in the opposite direction.