Picture-in-Picture (PiP) is a feature that allows users to watch a video in a small window while simultaneously using other applications on their device. This small video window can be moved around the screen, enabling multitasking without interrupting the viewing experience. PiP is commonly used in various platforms, including YouTube, Netflix, and video conferencing tools like Zoom. It enhances user convenience by allowing them to keep an eye on content while engaging in other tasks, such as browsing the internet or checking emails.