Microsoft Excel is a spreadsheet developed by Microsoft for Windows, macOS, Android and iOS.

MIPS (Microprocessor without Interlocked Pipelined Stages) is a reduced instruction set computer (RISC) instruction set architecture (ISA) developed by MIPS Computer Systems, now MIPS Technologies, based in the United States.

The center of the title bar displays either the name of the program

WIMP stands for "windows, icons, menus, pointer", denoting a style of interaction using these elements of the user interface.

Systems software are programs that manage the resources of the computer system.

RAM is Random Access Memory which loses its contents when the computer is switched off. it can also be called temperory memory

Floppy Disk: These are also called diskettes. These are very thin and flexible, so called floppies. It is a thin, round, flexible plastic, coated with metallic oxide, encased in a square plastic or vinyl jacket cover protection. It comes in various sizes: 3.5 inches (Micro-floppy) and 5.25 inches (Mini-floppy) in a diameter. The advantage of diskette is that it is highly portable and very cheap as compared to other secondary storage devices. But now a day people are not using this storage frequently. The capacity of floppy disk varies from 1.44 MB to 2.0 MB.

QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode.

TYPES OF MOUSE:-

WIRELESS MOUSE:
The Mouse without wire or cord is called wireless mouse or cordless mouse. Most wireless mice use radio frequency (RF) technology to communicate information to your computer. Since RF devices require two main components: a transmitter and a receiver,thats why wireless mouse also requires it.
Working :
• The transmitter is housed in the mouse. It sends an electromagnetic (radio) signal that encodes the information about the mouse’s movements and the buttons you click.
• The receiver, which is connected to your computer, accepts the signal, decodes it and passes it on to the mouse driver software and your computer’s operating system.
• The receiver can be a separate device that plugs into your computer, a special card that you place in an expansion slot, or a built-in component.

GSTICK MOUSE:
Gordon Stewart designed the Stick to add a more authentic and natural feel to artistic manipulations on both Macs and PCs. These mice are Wireless and pocket-sized. It looks like a pencil. gStick mouse is like a pencil. It can be used for web browsing, office work or whatever you do with your traditional mouse, with more comfort. It also features a scroll wheel that can be manipulated with a finger or thumb a button on either side of the wheel. It’s claimed that a single AAA battery will power the gStick for between three and five months.

OPTICAL MOUSE:
An optical mouse is an computer pointing device that uses a light-emitting diode an optical sensor, and digital signal processing ( DSP ).This mouse doesn’t have mouse ball and electro mechanical transducer. Movement is detected by sensing changes in reflected light, instead of interpreting the motion of a rolling sphere.
An optical mouse does not have moving parts that's why there is no need of cleaning .Also there is no mechanical fatigue and failure in this type of mice. The optical mouse takes microscopic snapshots of the working surface at a rate of more than 1,000 images per second. If the mouse is moved, the image changes . The best surfaces reflect but scatter light; an example is a blank sheet of white drawing paper.

A TRACKBALL MOUSE:
A trackball mouse is a pointing device.It consists of a ball held by a socket containing sensors to detect a rotation of the ball. The user rolls the ball with the thumb, fingers, or the palm of the hand to move a pointer. the operator just continues rolling with trackball but a mouse would have to be lifted and re-positioned. Some trackballs, such as Logitech’s optical-pickoff types, have notably low friction, as well as being dense (glass), so they can be spun to make them coast. Large trackballs are common on CAD workstations.

MECHANICAL MOUSE OR BALL MOUSE:
In 1972, Bill English (builder of Engelbart’s original mouse) invented the ball mouse, while working for Xerox PARC. In this, a single mouse was replaced by the external wheels, which could roll in any direction.
Mechanical mouse is a device integrated with an internal metal or rubber ball, which can spin in all directions (left, right, up and down). Thus, the display cursor moves as the mouse detects the direction. The ball in the mechanical mouse spins when it comes in contact with surface on which it is placed.

Question
What do you mean by convergence of technology?

Answer:
Convergence of technology is the interaction of two or more different technologies in a single device or system.

To make the convergence technology possible, high-bandwidth networks, high-speed Internet access, compression of software and hardware that combines one or more technologies and takes advantages of the new methods of connectivity are required.

A computer is a programmable machine. The two principal characteristics of a computer are: It responds to a specific set of instructions  in a well-defined manner and it can  execute a prerecorded list of instructions.

It is useful device for students for making projects and getting information of something. It is helpful for bank for getting data about anyone.

• Dot matrix printers are cheap and easily available in the market.
• Dot Matrix Printer can make carbon copies of the print out unlike non-impact printers.