Parallax -

What is a parallax effect? The definitive guide · Sketch Blog

: Content fades away or appears as users scroll past, often used to transition between story beats. 2. Optics & Shooting (Rifle Scopes) parallax

: Background images move slower than foreground content, creating a layered, 3D feel as the user scrolls down the page. What is a parallax effect

In web design, parallax is a popular technique used to create immersion and 3D depth. creating a layered

In precision shooting, "parallax" is a correction feature used to ensure accuracy.