Hard drive& SSD
The hard drive of a computer is located in the bottom of a computer of laptop, it is a device that stores and retrieves data. It saves all the information on your computer, for example documents and operating systeming. There is an arm that write the information onto a disk.
SSD stands for solid state drive and it is thinner, light and faster that the hard drive. It does the same job as the hard drive and stores and retrieves information. However it does not have an arm or a disk. SSDs are more expensive but don't always hold as much information as the hard drive. They are found in very thin laptops, for example ultrabooks or sleekbooks.
A monitor, otherwise known as a screen electronically displays what is happening. It shows what you are doing on your computer, laptop or tablet etc. A monitor provides visual display of what is happening, if a computer doesn't have a monitor then you wouldn't be able to see what you are doing.