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The Internet is a global network of interconnected computers, enabling users to share information along multiple channels. Typically, a computer that connects to the Internet can access information from a vast array of available servers and other computers by moving information from them to the computer's local memory. The same connection allows that computer to send information to servers on the network; that information is in turn accessed and potentially modified by a variety of other interconnected computers. A majority of widely accessible information on the Internet consists of inter-linked hypertext documents and other resources of the World Wide Web (WWW). Computer users typically manage sent and received information with web browsers; other software for users' interface with computer networks includes specialized programs for electronic mail, online chat, file transfer and file sharing.
The movement of information in the Internet is achieved via a system of interconnected computer networks that share data by packet switching using the standardized Internet Protocol Suite (TCP/IP). It is a "network of networks" that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and other technologies.
A computer is a machine that manipulates data according to a list of instructions.
The first devices that resemble modern computers date to the mid-20th century (1940–1945), although the computer concept and various machines similar to computers existed earlier. Early electronic computers were the size of a large room, consuming as much power as several hundred modern personal computers (PC).[1] Modern computers are based on tiny integrated circuits and are millions to billions of times more capable while occupying a fraction of the space.[2] Today, simple computers may be made small enough to fit into a wristwatch and be powered from a watch battery. Personal computers, in various forms, are icons of the Information Age and are what most people think of as "a computer"; however, the most common form of computer in use today is the embedded computer. Embedded computers are small, simple devices that are used to control other devices—for example, they may be found in machines ranging from fighter aircraft to industrial robots, digital cameras, and children's toys.
The ability to store and execute lists of instructions called programs makes computers extremely versatile and distinguishes them from calculators. The Church–Turing thesis is a mathematical statement of this versatility: any computer with a certain minimum capability is, in principle, capable of performing the same tasks that any other computer can perform. Therefore, computers with capability and complexity ranging from that of a personal digital assistant to a supercomputer are all able to perform the same computational tasks given enough time and storage capacity.
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Across the board on the television pages, I am seeing TV stations listed with their digital channel, and so far just about all of them have been incorrect. In the US, all TV stations are digitially defined using their ANALOG channel and sub channel. For example, if you have a station on analog channel 12 and digital 13, the ONLY digital channels will be 12.1, 12.2, etc. Putting "13.1", "13.2" is incorrect as in the legal scheme of digital tv in the US, this channel doesn't actually exist. The only spot the digital channel number exists is on the license, like with US FM radio. It is used as a reference for which set of frequencies the station will use to transmit their digital signal. The PSIP data (Program Service Information Protocol) is required by FCC law to "map" to the station's analog channel. (All FM Frequencies are assigned a channel number from 200 - 300). When these digital channel boxes were put on the TV profile pages, they should have only listed the analog channel (which is known as the "major" channel) and the appopriate minor channels (the .1, .2). I've corrected the ones Ive run across so far, but the rest need to be corrected before confusion sets in about the station's digital.
Hundreds of millions of people worldwide are enthusiastically embracing mobile digital communication. In this essay I am going to write about the mobile phone revolution, its manufactures and popularity of it, and its advantages and disadvantages.
A mobile is a type of sculpture that moves through the action of air currents. Phone, ring, call and telephone are all words that mean to use the telephone to speak to someone. Phone and ring are usual words in British English. Call is a word in American English. It is usually used in fairly formal situations. A mobile phone is a telephone that you can carry and use anywhere. To use it, you can either call someone or listen to voice massages that are left on your voicemail. You can also read messages or text someone. Mobile phone or cell phones are of a wide – ranged, portable electronic device used for mobile communication.
The introduction of cells for mobile phone base stations were invented in 1947 by Bell labs engineers at AT, T and was further developed by Bell labs during the 1960s.There are many manufactures of mobile phones, such as Nokia, Samsung, Motorola, Sony Ericsson and LG. Nokia is currently the world's largest manufacturer of mobile phones, with a global device market share of approximately, 40% in 2008. (www.mobilephone.com )
Between the 1980s and the 2000s. Mobile phones have gone from being an expensive item used by the business elite to a pervasive, personal communication tool for the public. In most countries, mobile phones outnumber landline phones, with fixed landlines numbering 1.3 Billion at the end of 2007.
In many markets e.g ( Japan and South Korea, to Scandinavia, to Malaysia Singapore, Taiwan and Hong Kong), most children at the age of 8 – 9 have mobile phones, and new accounts are now opened for customers aged 6 and 7, where mostly parents tend to give hand-me-down used phones to their youngest children.
Mobile phone has many advantages. For example, it is easy to establish communication. Also, it breaks the communication barrier. Moreover, you can take it with you. So, you don’t miss important calls. also, if you have car troubles or an accident you can call someone to help you. In addition, if you are lost you can call for directions or access GPS from your mobile phones. Also, it’s a great phone book and the messaging is great. Moreover, mobile phones having a camera are good. Also, you can play games text and someone can take it any where you like.
In the other hand, mobile phones have some disadvantages. First, some people are so consumed with their phone that even when they meet up with friends or family, they play with their phones. Doing that could be good when a person isn’t comfortable in front of the other; they just pretend to be busy with their phones. Also, people who get your number, they can call wherever and whenever they want which is a little too expensive.
To sum up, If you don't have a mobile phone, you can't communicate with other people and know what happens in the world. In this essay I have presented the definition of the mobile phone, the history, manufacturers and popularity of its advantages and disadvantages. I think mobile phones are very important for everyone and everywhere. So, I encourage everyone to use mobile phones especially when you go to another country and when you are out of your house because sometimes your family may like to inform you about something.
