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world wide web - Coggle Diagram
world wide web
web
1.0
find and share information, can't upload
gradually changed thx to new web-based tools
2.0
tools for sharing, creating, socialising are accesible to all
web became global phenomenon
3.0
the one we use today
computers are able to analyse data on the web
search engines try to understand human lenguage
we can use it by mobile
semantic web
4.0
active web
remove several steps needed when using 3.0
search engines will not disappear but become virtual assistant able to understand human lenguage
able to learn what you like
rss
really simple syndacation
produced in XML
code could be taken and displayed on a separate website (aggregator)
make content and information called feeds
aviable from a website for other webiste to syndacate
like subscribing to a magazine delivered periodically
lot of information
little organization
approaches to find information
index
search informations by categories
also have subcategories
enable to search by typing words
search engines
search through (like in a DB) typing keywords
gather information in a DB and a search tools finds the information wanted
some show the results
by relevance
first few sentences
title
url
meta search software
send agents on the internet that submit the search to many search engines, then index and compile a result
google
founded 1998 and became the larges search engines in 2000
became famous for the alorithm it use to search
page rank
measure the importance of a websiteby looking at the numbers of other sities that connect to it
select the most relevant pagesthat match the search and looks at the quality of the pages
googlebot send request to web server for a web page and download it, finds all the links and add them to a queue
then take the links from the the pages that he tooke the link of and add the them too
deep crawling
page that change frequently are called fresh crawls
google take the text and index itand store in a DB
indexer doesn't index common used words like "the, on, is, or ecc"
have a lot of services (work and productivity, translation ecc...)