When you want to create more engaging scroll-based experiences, combining ScrollTrigger with GSAP timelines opens up many possibilities. Pinning an element means keeping it fixed in place while the rest of the page scrolls, often to focus attention or sync an animation to scroll progress. By using the pin property inside a ScrollTrigger, you can lock a section or element in view for a specific scroll distance. Adding scrub: true allows you to tie the animation's progress directly to the scrollbar, so the animation plays forward or backward as the user scrolls, creating a smooth, interactive effect. This technique is especially useful for storytelling, product reveals, or any scenario where you want animation to be controlled by user scroll rather than play automatically.