A system
Ryan Wallas' Hardware
These are all the computer components your computer has mounted in it.
The mouse,keyboard,scanner,stylus,fingerprint scanner etc with your computer is and input devices. All the devices which provide information to your computer or thing that they are connected to are the input devices.
The main circuit board into which components are attached to in a computer is known as the motherboard or main board. This is what will hold all the essential parts in a computer.
Input devices of a computer are all the components which are used to feed data into the system, such as a mouse, keypad, joystick, etc.
Device Manager will have a list of all devices installed on your computer.
Computer Peripherals.
it shows all you hard drives and any other devices currently plugged in.
Secondary Storage Devices (such as Harddisk drives) which are non-volatile in nature stores all data that is put into computer even after the computer is truned off.
All of them would be classified under "hardware" although the other devices connected to the computer would be classified in the subcategory "peripherals".
Microphone is a input device because it's plugged in computer. All devices that you plug in computer are input devices.
All the devices properly installed on your computer will be listed. Some USB devices will be not explicitly listed, but the USB port will be.