Functional Image

An image that serves as an interactive control, such as a link, button, or form input, rather than simply conveying information. When an image is used as a link or button, its alternative text must describe the action or destination rather than the visual content of the image. For example, a linked company logo should have alt text like "Company homepage" rather than describing the logo itself. This distinction is important for screen reader users who need to understand what will happen when they activate the control.