Flat design is a visual style that uses simple shapes, solid colors, and clear icons instead of making controls look like physical objects. A button may be a colored rectangle rather than a shiny, raised shape.
This can make a page feel clean and modern. It can also make the interface easier to draw consistently across screens.
The important actions still need to be easy to recognize. If a flat button looks like ordinary text, people may not know they can tap it, so clear labels and visual cues matter.