Computer knowledge

 What is Data Security (pdf)? Data Security introduction: Data Security is necessary for the existence of many organizations and for all kinds of online services. In recent years, computer technology has become available to everybody at a very cheap cost. Also, specialized software packages are producing all kinds of solutions at a very low price. The result of all the advancements in technology and its affordability has made it possible to use computers in all fields of life. The Internet has connected millions of computers and people together and it has made possible the e-commerce, m-commerce, etc. Now you can purchase books, clothes, and all kinds of stuff online, by using credit cards. In today's world, online markets are available for all kinds of shopping like software, hardware,  electronics, medical equipment, etc. Data security definition: All the advances in data manipulation have given birth to a new issue known as Data Security. Data Security Explanation: The organizat

 What is the bus interconnection? Introduction: We know that a computer consists of a CPU, Main Memory MM, and I/O unit. For data to flow between these components we need some kind of interconnections, which is another very important component of the overall computer architecture. These components are interconnected by using a set of parallel lines to transmit the data from one location to another. Each of these lines can be used to transfer a sequence of bits from one component to the other component for data transfer. Definition: Each of these lines can be used to transfer a sequence of bits for communication from one component of the computer to the other component. This set of parallel lines is called a BUS. The system interconnection is used to communicate channel. System Bus: The bus used to connect the main components of a computer to the other component is called the system bus. Generally, the purpose of computers has a 70-100 line system bus.  The system bus is divided into th

   Types of communication media in networking Definition: For data to be transmitted from one location to another, some pathways or mediums must be used. These pathways are called communication channels. These are used for sharing and transmission of data for multiple types of media. The multiple files have a different type of data. Types of communication media: There are two types of communication media which are as follow: Guided Media It refers to channels that allow the transmission of data through physical media. These are also known as BOUNDED MEDIA. These different cables are used for connecting or transmitting data and information. Twisted Pair The telephone lines are used to carry most of the voice and data communications consist of a pair of thin-diameter insulted copper wires it is called twisted pairs. The wires are twisted around with one another to minimize interference of transmission from other twisted pairs in the cable. Twisted pairs have fewer bandwidths than coaxial

 Different Places where the computer is used    Overview:  Free trade agreements have led to the globalization of automobiles and mass transit . The free trade agreement has led to the globalization of commerce and increased competitiveness in labour markets. Business    In the organization relevent to business market. there are major business processes that provide the critical tasks such that customer bills ,analyzing sales of various products with different locations etc. In business, computers are used as given below. Marketing: Marketing applications provide information about the all oraganization's products ,its distribution marketing system ,its advertising of products and personal selling activities ,and its pricing strategies. Marketing applications help managers to develop strategies that combine the four major elements of marketing: Product ,Promotion ,Place and Price . Stock Exchange: Stoks markets around the world are in the transition .On some trading floors ,paper it

Entity-Relationship Model:  E-R Model Definition: Entity-Relationship Model is a logical representation of data in an organization. It views the entire system as a collection of entities related to one another. It is used to describe the elements of a system and their relationship.E-R models represent different things as entities. The connections among different entities are represented by relationships. These entities and relationships can be transformed into relational models. This model can be designed in the database using the relation model. It was introduced by PETER CHEN in 1976 Advantages of  E-R Model: The advantages are as follows: 1. Conceptual Simplicity: E-R model represents the concept of a database along with its entities and relationship in an easy way. It becomes even easier to create and manage the complex database. 2:Visual Representation: E-R  model provides a visual representation of data and the relationship among data. 3. Effective Communication Tool: The databa

   What Is The Features Of Word Processor? Word processor Introduction: Word processing software I probably one of the most frequently used packages in any organization. People use it for everything from quick notes to complex,book-length documents, In fact, it has been estimated that more than 90 percent of all personal computers have a word processor installed. Word processing is more than just electronic typing. It involves creating, editing, formatting, and printing documents in a variety of forms. You may have observed hundreds of newspapers, magazines, letters, and advertisements at your workplace, home, and surrounding; these are all miracles of word processing software. Business, Government agencies, Schools, and individuals create thousands of documents for numerous purposes on daily basis. Word Processor Definition: It is an application that provides extensive tools for creating all kinds of text-based documents. Word processor can manipulate not only the text but also enable

   Computer Network Topologies Computer Network Topology definition: The way in which computers or other devices are connected in a network is known as computer network topology. Shortly, the term network topology refers to the physical layout or shape of the network. Computer Network Explanation: In networking, the term topology is the way of connecting computers or nodes on a network There are many computers can be connected together in a computer network. Types Of Computer Network Topology: The commonly used network topologies are as following: 1.Bus Topology 2.Star Topology 3.Ring Topology 4.Tree Topology 5.Hybrid Topology 6.Mesh Topology Explanation Of Computer Network Topologies: The explanation of computer network topologies is as following. 1.Bus Topology: Bus Topology Definition: In Bus Topology, all nodes are connected to a common communication medium. Usually, a central cable is used as a communication medium, This cable is called BUS What Bus Topology? The computers or node

 Features Of Linux File System: Introduction to Linux course: Linux is a popular operating system for personal computers. Initially, Linux supported only the Intel 80*86 processors. Currently, Linux is one of the very few operating systems that run on a wide range of processors, including Intel IA-32, AMD, DEC, PowerPC, Motorola, SPAR , and IBM S/390. Brief History of Linux: Linux is introduced by Linux Torvalds, a student in Finland in 1991. When Linux Torvalds was studying at the University of Helsinki, he was using a version of the UNIX operating system called 'Minix' written by Andrew Tannenbaum. Feature of the Linux Operating System: Some important features of the Linux operating system. 1. Multitasking and Multiuser: Linux OS is a multitasking operating system, which is capable of running several programs at the same time without affecting the performance of usage of each program. It is also a multiuser system where several users can use the same machine. 2. Multiplatform