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At the risk of being pedantic, a mouse is a device that you move to cause the pointer to move on the screen and whose buttons you use to take action; the Apple Magic Mouse’s top surface also enables you to use gestures to control your Mac as if you were using a trackpad. Many types of mice are available, and they have different features and feel differently in your hand. They also come in a variety of sizes. All current mice share the capability to cause the pointer to move on the screen and have at least two buttons, although most have more than that.
Like other input devices, current mice connect to your Mac with a USB cable or wirelessly.