An image with ROI written on it
Image credit: background image by (aplaceforcreation) and money image by (nilsson)

When you invest in something, you expect a return. The investment can be in terms of anything, money, time, resources, etc.

For design, the investment can be in terms of hiring a new designer or an intern, working on a design system, assign more time for research, redesign a flow, design a feature, etc.

You need to care about design ROI to gain executive buy-in and to obtain any resources if you need it.