What is ray tracing in gaming and does it really make a difference?

Ray tracing makes light's behavior more realistic in supported games, but your PC has to use a lot of horsepower to make that happen.

Ray tracing makes light&#39;s behavior more realistic in supported games, but your PC has to use a lot of horsepower to make that happen.<p><img src="https://www.engadget.com/img/gallery/what-is-ray-tracing-in-gaming-and-does-it-really-make-a-difference/intro-1791383266.jpg" /></p>