Term 3 2009 First sessions

Welcome to Term 3 of U3A Introduction to Digital Photography




The World Wide Web is a system of interlinked hypertext documents accessed via the Internet. With a web browser, one can view Web pages that may contain text, images, videos, and other multimedia and navigate between them using hyperlinks. Using concepts from earlier hypertext systems, English physicist Tim Berners-Lee, now the Director of the World Wide Web Consortium,
wrote a proposal in March 1989 for what would eventually become the
World Wide Web. He was later joined by Belgian computer scientist Robert Cailliau while both were working at CERN in Geneva, Switzerland. In 1990, they proposed building a "web of nodes" storing "hypertext pages" viewed by "browsers" on a network,^[1] and released that web in December.^[2]




Universal Serial Bus (USB) is a serial bus standard to connect
devices to a host computer. USB was designed to allow many peripherals
to be connected using a single standardized interface socket and to
improve plug and play capabilities by allowing hot swapping; that is, by allowing devices to be connected and disconnected without rebooting the computer or turning off the device.





You'll probably only ever see http; https; and ftp but there are other "things"
that can be on the front of the internet address.
http://en.wikipedia.org/wiki/Application_Layer


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Electronic mail, often abbreviated as email or e-mail, is a method of exchanging digital messages, designed primarily for human use. E-mail systems are based on a store-and-forward
model in which e-mail computer server systems accept, forward, deliver
and store messages on behalf of users, who only need to connect to the
e-mail infrastructure, typically an e-mail server, with a
network-enabled device (e.g., a personal computer) for the duration of
message submission or retrieval. Rarely is e-mail transmitted directly
from one user's device to another's.


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Antivirus (or anti-virus) software is used to prevent, detect, and remove malware, including computer viruses, worms, and trojan horses. Such programs may also prevent and remove adware, spyware, and other forms of malware..


To see just how many there are go to ....
http://www.dmoz.org/Computers/Security/Malicious_Software/Viruses/Detection_and_Removal_Tools/


Some good "Free" ones are AVG Free http://free.avg.com/
and Avast http://www.avast.com/eng/avast_4_home.html