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Newton's third law:
It states that 'for every action, there is an equal and opposite reaction. They always act on two different bodies'.
If a body A applies a force ${F}_{A}$ on a body B, then body B reacts with force ${F}_{B}$ on body A, which is equal to ${F}_{A}$ in magnitude but opposite in direction.

${F}_{B}$ $$=$$ $$–$$${F}_{A}$

Examples:
• When birds fly,
Action - Birds push the air downwards with their wings
Reaction - Air pushes the bird upwards
• When a person swims,
Action - A person pushes the water using the hands backwards
Reaction - The water pushes the swimmer in the forward direction
• When you fire a bullet,
Action - The gun recoils backwards, and the bullet moves forward
Reaction - The gun equalises this forward action by moving backwards