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WHAT IS A MOBILE

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What is a mobile.           A   mobile phone ,   cellular phone, cell phone ,   cellphone ,   handphone , or   hand phone , sometimes shortened to simply   mobile ,   cell   or just   phone , is a portable   telephone   that can make and receive   calls   over a   radio frequency   link while the user is moving within a telephone service area. The radio frequency link establishes a connection to the switching systems of a   mobile phone operator , which provides access to the   public switched telephone network   (PSTN). Modern mobile telephone services use a   cellular network   architecture and, therefore, mobile telephones are called   cellular telephones   or   cell phones   in North America. In addition to   telephony , digital mobile phones ( 2G ) support a variety of other   services , such as   text messaging ,   MMS ,   email ,   Internet access , short-range wireless communications ( infrared ,   Bluetooth ), business applications,   video games   and   digital photography .
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WHAT IS A COMPUTER KEYBOARD

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  For other types of keyboards, see   Keyboard (disambiguation) . A  computer keyboard  is an  input device  that allows a person to enter  letters ,  numbers , and other  symbols  (these are called  characters  in a keyboard) into a  computer . It is one of the most used input devices for computers. Using a keyboard to enter lots of  data  is called  typing . A  QWERTY  computer keyboard in US layout. A keyboard contains many  mechanical   switches  or  push-buttons  called "keys". When one of these are pushed, an  electrical circuit  is closed, and the keyboard sends a  signal  to the computer that tells it what letter, number or symbol it would like to be shown on the  screen . The computer's  CPU  then shows the character on the screen, usually at the place where the  cursor  is. Besides entering characters, computer keyboards also have special keys that change the symbol (such as  shift  or  caps lock ) or give the computer special commands (such as the  arrow keys ,
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What is acomputer

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What is a computer? A  computer  is an electronic device that manipulates information, or data. It has the ability to  store ,  retrieve , and  process  data. You may already know that you can use a computer to  type documents ,  send email , play games , and  browse the Web . You can also use it to edit or create  spreadsheets , presentations , and even  videos . Watch the video below to learn about different types of computers. Looking for the old version of this video? You can still view it  here .  software Before we talk about different types of computers, let's talk about two things all computers have in common:  hardware  and software . Hardware  is any part of your computer that has a  physical structure , such as the keyboard or mouse. It also includes all of the computer's internal parts, which you can see in the image below. Software  is any  set of instructions  that tells the hardware  what to do  and  how to do it . Examples of software include web browsers, games
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