Web Applications

• It is a collection of information that has grown up on computers
• Connected to the internet
• Available for anyone to access
• Info made up of webpages
• described as a multimedia service

Features

• Written using HTML
• Viewed using a web browser
• Contains Hypertext (w/ clickable links to other pages on web)
• contains sound,video,animation,graphics and hypertext
• Hypertext transfer protocol to send pages across the internet.  

• Network of computers
• Communicates with several other computers in the network
• World side communication system
• links geographical seperate locations
• with used of variety of telecommunication links eg. telephone links & satelite.

• Reference to the address opf a resource on the internet

• application protocol used on WWW
• defines how data is structured, transmitted
• specifies how broswers and web servers should actin repsonse to requests.

• represents standard set of rules
• ensure proper transfer of info between computers on the internet.
• define how data is structured and what control signals are used.
• Everydevice linked to newtowkr uses IP protocol identified by a unique IP address.
• allows messages and data to be routed to correct address on the network.

• consists of four numbers seperated

• allows users to view and use the web pages on the internet
• Responsible for requesting grpahics and text of webpages from servers on the internet
• assembling them to display
• HTML format
• used to view any HTML pages whether they are online or offline.  

• Computer that delivers webpages across the internet or within an intranet.
• processes requests for info that comes from the internet infastructure. 
• contains application software to enable transmision of content
• uses client-server technology

• Allows internet to be present
• provides access to the web server and web space to store a website or webpages
• this company allow website to be available online
• web space- to store website
• email feature
• interface for managing website online
• customer support 

• most common protocol
• transfer files across internet
• between client and server devices.

• direct links to internet
• accepts transmisson from users over communication lines-passes onto internet
• sells internet access to companies and indivduals
• access to web servers adn connect to search engine on net

provides services

• variety of bandwith options
• email service
• security features- anti-virus
• web hosting ( allows to upload own webpages)
• Customer service
• Telephone/digital tv package
• Website filtering (filter unsuitable content)

• web-based tool that searches for info using keywords/criteria
• it returns results as website links based on criteria provided
• some use a spider/webcralwer
• 'crawls' web server and constructs index of pages
• users searches topic using net- index made as webcraler is used
• ensures index is up to date
• diff SE search diff servers

• meta tags-specify key words in heading of html page
• these words help SE to catergorise pages
• decide whether/not to indluce them in the results for search

• allow browsers to download website images,datad and documents=faster viewing in future.
• local copy of info is kept
• able to load at least some info from each page you have visited without downloading that info again from the server.
• decrease the time it takes to load a webpage.

• smalls files dowloaded to a comp when visitng website
• store previous activity and user preferences
• Info used when user visits site again
• used to track a users browser hsitory over period of time
• considered as a privacy concern
• asked to accept the cookies associated with a website

• a website acts as main entry point to a group of web services
• can require user to logon

provides

• email
• links to other websites
• search engines

• collectins of HTML pages
• linked together on WWW

• page of info stored on WWW

Features

• Written using programming language HTML
• viewed using web browser
• Contain HYPERTEXT- clinkable links to other pages on web
• contains sound, video, animation, graphics and hypertext as well as simple text