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The Internet, Internet Services, Real-Time Communication, Finding…
The Internet
Communication Systems
4 elements needed to communicate: who communicates, what is sent, how it is sent, and what language/system is used
In computer communication: the computer carries the message, users are the communicators, files are the content, and protocols are the language
Some media reach many people at once, others only connect two people
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Internet Services
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Web pages: documents with text, images and links to other pages, opened through a browser
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Real-Time Communication
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Videoconferences require a camera, microphone and specific software
Poor internet connection causes delays, interruptions or disconnection
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Finding Information
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Portals are starting points that give access to many services at once, either general or specialised
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Computer Networks
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Some networks have a main powerful computer (server) that controls everything and smaller ones (terminals) that depend on it
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Email
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Every user has a unique address made of a username, the @ symbol, and the mail server
Web mail: accessed from any browser, no installation needed, messages stay on the server
POP mail: requires an installed program, messages download to your device
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The Internet
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Two types of domains: by country (.es, .uk, .fr) or by type of organisation (.com, .edu, .gov, .org)
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Browsers and URL
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Every web page has a unique address called a URL made of three parts: the protocol, the service, and the domain name
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