Gradation, or gradient, refers to a gradual change in color, tone, or intensity. It is often used in art and design to create depth and dimension, allowing for smooth transitions between different shades or hues. This technique can enhance visual appeal and guide the viewer's eye through a composition. In nature, gradation can be observed in phenomena like sunsets, where the sky shifts from bright orange to deep blue. In graphic design, gradients are commonly applied in backgrounds, buttons, and illustrations to add interest and sophistication. Tools like Adobe Photoshop and Illustrator facilitate the creation of these effects.