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Click the Apple menu. Click About This Mac. Review your Mac's system information.

Article:
It's the apple-shaped icon in the top-left corner of your Mac's screen. This option is near the top of the drop-down menu. There are several tabs at the top of the "About This Mac" window that you can use to view different type of information:   Overview - View your Mac's operating system, processor, and memory information here.  Displays - View information about your Mac's screen and any attached displays.  Storage - View your Mac's storage allocation, including how much space files are taking up and how much space remains.  Support - View a list of resources to help solve any potential problems.  Service - View your Mac's service history (e.g., warranty information).