When someone sits down to use an app, the app will have higher utility if it makes whatever task they're aiming to do, easier to do. When designing an app's UI,

When someone sits down to use an app, the app will have higher utility if it makes whatever task they're aiming to do, easier to do. When designing an app's UI, making something easy for users is a matter of understanding what their expectations are and matching what they look for by default when they try to do a thing in your app with what you show them in the UI. That the thing they look for is the thing you show them is both the manipulation and the thing that raises the utility.