A video player lightbox is a web design feature used to display video content in a pop-up window, typically overlaid on the current page without navigating away or refreshing. This technique creates a more immersive user experience by allowing the video to be played in an enlarged view, while the rest of the page remains visible in the background, dimmed or blurred. Lightboxes are often used for quick access to video content without cluttering the layout of a webpage, and they typically allow users to close the player easily once the video is finished, returning to the previous page or content.

The video player lightbox is often implemented using JavaScript and CSS, allowing for responsive designs that adjust to different screen sizes and devices. It can support various video formats, including embedded content from platforms like YouTube or Vimeo, or self-hosted videos. This approach is popular in modern web design for e-commerce sites, portfolio galleries, tutorials, or any platform where video content is a key feature but needs to be presented in a non-intrusive way.