Discuss the role of a physics engine in game development and how it enhances the realism of game interactions.

A physics engine simulates physical phenomena like gravity, collisions, and fluid dynamics, enhancing the realism of game interactions. It provides a mathematical framework for objects’ movement and interactions, ensuring consistent and believable behavior. By using a physics engine, developers can create more immersive and dynamic environments where objects respond naturally to forces and collisions, significantly improving the player’s experience.