A Vector Drawable is a type of graphic that uses mathematical equations to define shapes, lines, and colors, allowing for infinite scaling without losing quality. Unlike raster images, which are made of pixels, vector graphics maintain clarity at any size, making them ideal for responsive design in applications and websites. In the context of Android development, vector drawables are often used to create icons and illustrations. They are stored in XML format, which allows developers to easily customize colors and sizes, ensuring that graphics look sharp on various screen resolutions and densities.