Lesson Objectives Don’t panic Understand what the Internet is Understand what a browser is Understand how to use it efficiently and maybe start to learn what some of the Internet terms mean Http isp html url jpg gif png mp3 www
background 1969 - Miltary network ARPANET 1984 - Universities created JANET 1991 - Tim Berners Lee developed WWW 1993 - The first browser is only 8! 1995 - The first search engine is only 6!
what is it? Means of communication Global network of computers Interconnecting computers of all sizes
connections A networked computer A web server Telephone connection modem
finding web sites A networked computer A web server Telephone connection modem Search engines
Get on Access Modem dials a phone number ISP or web server checks your ID Web browser opens You see the home page At the last count there were 170,421,809,001 web pages any one could be your home page so why stick with your ISP adverts?!
Get what you want Find things you want the address bar use a url Go favourites? Add them to your list Been there, done that? Check out the History Still looking? Knowing that url stands for universal resource locator will impress people Knowing that http stands for hypertext transfer protocol will get you into trouble if you don’t know what protocol is
Loads of data Text pages images animated graphics video sound files music databases spreadsheets presentations Copying other people’s files is downloading Publishing your own is uploading Getting rid of stuff is offloading a 3 minute CD track can take 20 minutes to download on an average phone link
The size of files is measured in bytes 1KB = 1000 bytes 1MB = 1000KB = 1000000 bytes The speed data travels along a phone line is measured in bits per second I byte is about 8 bits So a 5MB file = 5000000 x 8 = 40000000 bits A typical phone connection speed is 40000 bits per second So a 5MB file would take 1000 seconds = TOO LONG
the future Dial-up connections will go out of fashion fast, always on type connections will take over enabling high quality video PC monitors replacing tv sets wireless access via mobile phones genuine videophone capability
WARNING!! Information overload Your brain is shutting down... 10 9 8 7 6 5 4 3 2 1
Warning! The Internet will seriously damage your social life. Warning! The Internet will seriously damage your social life.
The truth is out there... and so is an awful lot of rubbish!