A framebuffer is a portion of memory used to store pixel data for images displayed on a screen. It acts as a buffer between the computer's graphics processing unit (GPU) and the display, allowing for smooth rendering of graphics. Each pixel's color information is stored in the framebuffer, which is then sent to the monitor for display. Framebuffers can be used in various applications, including video games and graphic design software. They enable features like double buffering, which helps reduce flickering and tearing during fast motion. This technology is essential for creating high-quality visual experiences on devices like computers and gaming consoles.