Explain Why You Need to Be Able to Distinguish Between

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The Answer is While users can interact via touch with an app, they also use touch to perform browser and device interactions, known as gestures , for activities such as scrolling the page and viewing device notifications. For instance, in addition to executing code in response to a touchmove event that you specify, the device's operating system may also interpret the touchmove event as the user interacting with the interface to scroll the page. As you can imagine, users would find such unpredictable results frustrating.
To ensure that the operating system interface does not respond to events generated when users interact with an app, you can use the preventDefault( method. By adding the preventDefault( method within event handler code, you prevent touch actions on specific elements from also triggering interface gestures.

Explain Why You Need to Be Able to Distinguish Between

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