What is one way to fill a selection in design software?

Applying a gradient with the Gradient Tool is a legitimate method for filling a selection in design software. This tool allows designers to create smooth transitions between colors, giving depth and a professional look to the selected area. It enables the user to control the angle, width, and overall appearance of the gradient, making it versatile for various design applications.

Using the Gradient Tool can enhance visual interest in a project and is especially useful in backgrounds, shapes, or anywhere a smooth color transition is desired. The tool effectively contributes to the creative aspect of design by allowing the incorporation of multiple colors and blending techniques within the selected area.

In contrast, the other tools mentioned do not primarily serve the function of filling selections. The Eraser Tool removes parts of the design rather than filling, the Text Tool is specifically for adding text elements rather than filling selections, and the Brush Tool is mainly used for painting or drawing freehand rather than solidly filling a defined area.