20199492
Description
Mind Map by Emma Appah, updated more than 1 year ago
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Created by Emma Appah
about 5 years ago
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Search Engines
- How to tell and check that a website is reliable
- Look for websites with
established institutions
- Avoid commercial/
advertisement sites
- Look for sites
with expertise
- Check the date
- Check the web address
- Look for websites with
established institutions
- How to narrow down your search
- Use more
than one
word
- Request to specify
certain words by
using the plus/
minus sign in front
of the desired words
- Use words that are unusual
and are popular to the topic
that don't show up
together in other contexts
- search the tool list to
specify the words to a
certain category e.g.
time
- Use more
than one
word
- Search Engines
- A search engine is a
programme that
searches forand
identifies items on
the worldwide web
that have been
specified by the user
- The search engine does
not run your search in
real time because there
are billions of new
websites being created
every minute and if it
were to, it'd take forever.
- They are constantly
scanning the World
Wide Web (WWW) in
advance, recording
the information for
your search later.
- A search engine is a
programme that
searches forand
identifies items on
the worldwide web
that have been
specified by the user
- WWW
- The internet is a web
of pages connected to
eachother by
hyperlinks
- Search engines are
constantly running a
programme called a
spider.
- Spiders crawl through all the
webpages, collecting information
about them. Each time it finds a
hyperlink it follows it until it has
visisted every page it can find on
the internet.
- For each page the spider visits, it
records any information that it
might need for a search ina
aspecial databasecalleda search
index.
- The internet is a web
of pages connected to
eachother by
hyperlinks
- Ranking with Results
- When the user searches for
something onthe search
engine, it looks up each of
those words in the search
index, which usually
returns millions of results.
- To find the best
matches from the
search index, the search
engine might need to
guess what you are
looking for.
- Each search engine has it's own
ranking algorithm based on what it
thinks you want.
- Websites often make money when
you visit them so spammers try to
game the search algoritm so that
their websites are listed higher in
the results. So search engines
reguarly update their algorithms
to prevent fake or untrustworthy
sites from reaching the top.
- Search engines are always evolving to
return results better, faster and more
recent ones by using informatio that
the user didn't explicitly provide (like
location).
- When the user searches for
something onthe search
engine, it looks up each of
those words in the search
index, which usually
returns millions of results.
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