Printers are divided into two main categories:
(i) Impact Printers
(ii) Non Impact printers

Natural Language Processing is the ability of a computer program to understand human language. It is a component of artificial intelligence.

(i) The ALU performs arithmetic operations.
(ii) The result of an operation is stored in internal memory of CPU.
(iii) The logical operations of ALU promote the decision making ability of a computer.

The CPU has three components which are Control Unit, Arithmetic and logic unit (ALU) and Memory unit.

(i) Optical mouse uses Red, Blue or Green led whereas Laser mouse uses only infrared led.
(ii) Optical mouse has three buttons; Laser mouse has as many as 12 buttons and can be programmed by user.
(iii) Optical mouse is less sensitive and sensitive towards surface but Laser mouse is highly sensitive and able to work on any hard surface.

(i) The ALU is a part of the CPU where various computing functions are performed on data.
(ii) The ALU performs arithmetic operations such as addition, subtraction, multiplication, division and logical operations.
(iii) The result of an operation is stored in internal memory of CPU.
(iv) The logical operations of ALU promote the decision-making ability of a computer.

The various applications of computer.
(i) Business
(ii) Education
(iii) Marketing
(iv) Banking
(v) Insurance
(vi) Communication
(vii) Healthcare
(viii) Engineering - Robotics, Nano technology, Bio Engineering

(i) The Sixth Generation, computers could be defined as the era of intelligent computers, based on Artificial Neural Networks. This generation gave a start to parallel computing.
(ii) One of the most dramatic changes in the sixth generation will be the explosive growth of wide is a component of artificial intelligence
(iii) Robotics is a branch of engineering that involves the conception, design, manufacture, and operation of robots.
(iv) This field overlaps with electronics, computer science, artificial intelligence, mechatronics, nanotechnology and bioengineering.
(v) Artificial neural networks (ANNs) are computing systems inspired by the biological neural networks that constitute animal brains.
(vi) Such systems learn (progressively improve performance on) tasks by considering examples, generally without task-specific programming.
(vii) An ANN is based on a collection of connected units or nodes called Artificial Neurons (analogous to biological neurons in an animal brain).
(viii) Each connection (synapse) between neurons can transmit a signal from one to another. The receiving neuron can process the signal(s) and then signal neurons connected to it.
(ix) Parallel computing is a type of computation in which many calculations or the execution of processes are carried out simultaneously.
(x) Large problems can often be divided into smaller ones, which can then be solved at the same time. There are several different forms of parallel computing: bit-level, instruction-level, data, and task parallelism.
(xi) Parallelism has been employed for many years, mainly in high-performance computing, but interest in it has grown lately due to the physical constraints preventing frequency scaling.
(xii) As power consumption by computers has become a concern in recent years, parallel computing has become the dominant paradigm in computer architecture, mainly in the form of multi-core processors.

Non-Impact Printers:
(i) These printers do not use striking mechanism for printing. They use electrostatic or laser technology.
(ii) Quality and speed of these printers are better than Impact printers. For example, Laser printers and Inkjet printers are non-impact printers.
Laser Printers:
(i) Laser printers mostly work with similar technology used by photocopiers.
(ii) It makes a laser beam scan back and forth across a drum inside the printer, building up a pattern. It can produce very good quality of graphic images.
(iii) One of the chief characteristics of laser printer is their resolution - how many Dots per inch(DPI). The available resolution range around 1200 dpi. Approximately it can print 100 pages per minute(PPM).

Inkjet Printers:
(i) Inkjet Printers use colour cartridges which combined Magenta, Yellow and Cyan inks to create color tones.
(ii) A black cartridge is also used for monochrome output. Inkjet printers work by spraying ionised ink at a sheet of paper.
(iii) The speed of Inkjet printers generally ranges from 1-20 PPM (Page Per Minute).
(iv) They use the technology offering ink by heating it so that it explodes towards the paper in bubbles or by using piezoelectricity in which tiny electric currents controlled by electronic circuits are used inside the printer to spread ink in jet speed.
(v) An Inkjet printer can spread millions of dots of ink at the paper every single second.

Impact Printers:
(i) These printers print with striking of hammers or pins on ribbon. These printers can print on multi-part (using carbon papers) by using mechanical pressure.
(ii) For example, Dot Matrix printers and Line matrix printers are impact printers.
(iii) A Dot matrix printer that prints using a fixed number of pins or wires. Each dot is produced by a tiny metal rod, also called a "wire" or "pin", which works by the power of a tiny electromagnet or solenoid, either directly or through a set of small levers.
(iv) It generally prints one line of text at a time. The printing speed of these printers varies from 30 to 1550 CPS (Character Per Second).
(v) A Dot matrix printer that prints using a fixed number of pins or wires. Each dot is produced by a tiny metal rod, also called a "wire" or "pin", which works by the power of a tiny electromagnet or solenoid, either directly or through a set of small levers.

(vi) It generally prints one line of text at a time. The printing speed of these printers varies from 30 to 1550 CPS (Character Per Second).