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If you've opened a car door even one time, you intuitively then know how to open just about any car door because of the shape, design and purpose of the handle. https://images.squarespace-cdn.com/content/v1/58feb7322994caa7f8632d16/1494211629253-NH89HDPYVO6VNKOEUDFN/image-asset.png Blog - Affordance in User Interface Design What's commonly knows as a "spinner" control (the pink plus and minus buttons) is another example of affordance in UI design. The acceptable input here in this situation is a whole number. Instead of asking the user to key this in and possibly making a mistake, the UI affords the user the chance to use the appropriate plus or minus button to configure the desired input. https://images.squarespace-cdn.com/content/v1/58feb7322994caa7f8632d16/1494211184158-7P2R079UR4C7KPIYYF3P/image-asset.png Blog - Affordance in User Interface Design The toggle switch pictured above is a UI control that looks and acts kind of like a light switch in the physical world. It is either on or off, there is no in between. It is fairly obvious what you're supposed to do with it; clicking or tapping the control toggles the switch to the only other state that it is allowed to be in. In this case, it even toggles through a slight animation sequence to make it feel even more like a real-world control. This is one example of where affordance can be used in a UI design. https://images.squarespace-cdn.com/content/v1/58feb7322994caa7f8632d16/1493952733282-DG8PA7KPLBLC8UKQSXAA/image-asset.jpeg Blog - Affordance in User Interface Design Another example is a light switch. When you see a switch on the wall you instinctively know there is only one thing you can do with it. You don't need a label or a document to tell you what to do. https://images.squarespace-cdn.com/content/v1/58feb7322994caa7f8632d16/1493952326590-6FX00MRVZ6IVATY44BGE/image-asset.jpeg Blog - Affordance in User Interface Design When we see a keyhole, we intuitively know that we can insert a key into it and turn the knob. There are actually two examples of affordance going on here: one example is the keyhole, the second is the door knob. Keyholes "afford" (are for) keys. 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