Computer hardware is the physical components of a computer system that you can touch and see. Hardware is essential for a computer to function, and it enables tasks like input, output, storage, communication, and processing. 

Here are some examples of hardware components:

• Central processing unit (CPU)

  The "brain" of the computer that fetches, decodes, and executes instructions 

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• Random access memory (RAM)

  Provides temporary storage for information from applications and systems currently in use 

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• Graphics processing unit (GPU)

  Processes graphical data, and can be upgraded to improve gaming, video, or visual performance 

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• Power supply unit (PSU)

  Takes electricity from an external power source or laptop battery and passes it to the motherboard 

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Hardware is different from software, which is the intangible part of the device that includes programs, applications, and data. Software and hardware work together to enable a computer to produce useful output.