Data

• Computers and communication


  How joining computers you & communicate
• Digital data


  Data stored and processed electronically as numbers
• Data transmission


  1. Microphone converts sound to electronic signals

  2. Radio transmitter converts electronic signals to radio waves

  3. Radio receiver picks up radio waves and converts to electronic signals

  4. Speaker converts electronic signals to sound
• Using computers for data transmission

  1. User inputs message on keyboard

  2. Computer converts input to digital data

  3. Modem converts digital data to form that can be sent over cables

  4. Receiver converts signal to digital data

  5. Receiver displays message
• Modem


  Device used to convert digital data into a form that can be sent over cables
• Router


  Device that connects a home internet connection
• Wireless connection allows messages to be sent to the router from any computer in your home</b>
• Modem converts data from your computer's language to the language used by cables</b>
• If David sent a video message instead of text


  • Input devices he would use
  • Output devices Mary would use
• Data communication has become an important part of our day-to-day lives
• First text message was sent, 3 years after the World Wide Web was invented


  1992
• Real-time communication


  Communication where you can exchange information quickly and get an immediate reply
• Asynchronous communication


  Communication where there is a gap between each step, like sending a letter
• More than 15 SMS messages are sent every minute, every day worldwide
• Network


  Two or more computers connected together
• What networks are for

  • Communication
  • Sharing devices
  • Sharing files
• What makes a network


  • Special network devices
  • Cables
  • Network software
  • Rules
• Local Area Network (LAN)


  Network of computers in a single building
• Wide Area Network (WAN)


  Network of computers that are far apart
• Metropolitan Area Network (MAN)


  WAN that covers a medium-sized area, usually a city
• Wired connection


  Network cable connecting computer to wall socket
• Wireless (Wi-Fi) connection


  Network connection using a Wireless Access Point (WAP)
• Nearly every network will connect to the Internet
• Personal Area Network (PAN)


  Designed to allow an individual to work with all the devices they use including table smartphones and wearable devices
• Wired connection


  A network cable is used to connect a socket in the computer to an identical socket on the wall of a room
• Wireless (Wi-Fi) connection


  Networks use a device called a Wireless Access Point (WAP) to provide wireless connection
• Hotspot


  A place where a wireless signal is available
• Connection to the Internet

  Allows emails and other communications to be sent outside the LAN
• Connection to the Internet


  Can allow people to work away from the building where the LAN is located and still access files and other services
• Web page


  Contains information about a single topic
• Web browser


  Special software used to browse the web
• Web browsers


  • Firefox, Google Chrome, Microsoft Edge
• Search engines


  Typing a question to a search engine is a good way to find information on the web
• Tips for searching the web

  • Use a short clear description
  • Think about the best order for your keywords
  • Do not use punctuation or short, common words
• Website


  Web pages are kept together on a website like pages in a book
• Weblink


  A word or button that you can click to find new information
• There will be several results listed on the search page. You can look at the pages and decide which seems to get the best information. Now you know the River Cauto is the answer you are looking for you can search "River Cauto Cuba" to find more detailed information.
• Email


  A way to send messages electronically
• Sending an email


  1. Find out your email address

  2. Open the email application

  3. Click the "Create email" or similar button

  4. Type the recipient's email address, subject, and message contents

  5. Click "Send"
• Using email safely


  • Do not share your name, address, or phone number
  • Open the email application from a trusted source
  • Look out for the "To" field to ensure you are sending to the correct recipient