•The temporarily stores data in the RAM until

•The computer
case is a metal
and plastic box that holds the
all of  the main computer components.
It usually has an On/Off button and an optical drive
 and either sits next to the monitor or onThe motherboard is the computer’s main circuit board
into which all other components connect. The motherboard holds the Central Processing Unit, memory,
expansion
cards,
connectors for the hard drive and optical drives, and connections
to the ports.the
floor.The CPU, or the processor, is the core or the brains of the computer, found in
the computer case of the motherboard. The CPU interprets codes
it receives from the other components and
makes the codes usable
to the operating system. The processor’s speed determines the
speed
of the computer, measured in megahertz or gigahertz. •Whenever the computer performs functions, it temporarily stores data in
the RAM until it needs it again.
The RAM,
or the Random Access Memory, is used for instant or short-term memory. The more
RAM a computer has, the more things it can do at the same time. If
the user of the computer often runs many programs at once, they might consider
upgrading the RAM to increase computer speed. If it doesn’t have enough RAM, it run more
slowly when there are multiple programs open.•The power supply unit in a computer plugs into the wall,
converting the power from the wall outlet to the type of power that runs
the computer and sending the power through cables to the motherboard and other
components.•The video
card sends
graphical
information to the monitor. It allows the user to see displays on the monitor. Most
computers have a Graphics Processing Unit built into the motherboard
instead of
a video
card. •The
hard drive is used for long-term storage of software, documents, and
files.
When the computer
user
saves a
file, the data is copied to the hard drive, but when it is
opened again, the computer copies some of the data from the hard drive to the RAM.
Unlike with the
RAM,
this data
on the hard drive is still saved when the computer is turned off. •A
network card allows the computer to connect to a network and access the
Internet, connecting with an Ethernet cable or through Wi-Fi. Sometimes,
motherboards
have built-in network connections instead.•The
optical drive, whether slot loading or tray loading, is the drive used to burn
or read CDs,
DVDs and Blu-Rays, using light to read and write data on the disks. They
connect directly to the motherboard.•The monitor works with the video card to display images and text on its screen, which
allows the user to use and operate the computer
(using the keyboard or the mouse). Also, they usually have control buttons that change
the monitor’s
display settings,
and some
have
built-in
speakers.•The keyboard is used
to communicate with a computer. It has alphanurmeric
keys, a spacebar, a tab key, an enter key, a backspace key, and many others.
One can communicate with the computer by pushing these keys.•The mouse is also used to communicate with the computer. There are
two main types
of mice. An
optical mouse uses an electronic eye, but a mechanical mouse
uses a
rolling ball to detect the user’s movement. By
moving the device
over a
flat surface
or a mouse pad, the computer
user can
move
the pointing device across the screen, click on or move things on the
screen.