RGBA stands for Red, Green, Blue, and Alpha, which are the four components used to define colors in digital graphics. Each color component (Red, Green, and Blue) can have a value ranging from 0 to 255, allowing for over 16 million possible color combinations. The Alpha component represents the opacity of the color, with 0 being fully transparent and 255 being fully opaque. This color model is widely used in web design, graphic design, and digital art because it allows for more flexibility in creating colors and effects. By adjusting the RGBA values, designers can achieve various shades and transparency levels, enhancing visual appeal and depth in their projects.