How does the Graphic Raycaster component work in Unity?

What is a raycast? What are blocking objects and blocking mask? A ray is a mathematical device that starts at an origin point and continues on in a specific direction forever. With a raycast you're casting a ray, cast being used like the word throw. It's like if you threw a rock and it continued on in that direction forever, it wouldn't stop until it hit something. You're interested as to whether

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Graphics Raycasterのblocking objects/maskの動きについて