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Information Reliability

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 4 I can explain the difference between a web browser and a search engine.
 5 I can use internet search engines effectively, including using Boolean operators

🏁 Learning Objective 7 :- I can explain the difference between a web browser and a search engine.


Search engines

What are Search engines?


Search engines are programs that are designed to search the internet for us. They scour through all the billions of webpages, looking for information that matches what you are seeking. By using a search engine you can find information in seconds.

Do a search for the names of different search engines, see how many you can find. Then create a list of real search engines from the list below by clicking on the x of the ones that are not real to remove them.

Task

Do a search for the names of different search engines, see how many you can find. Then create a list of real search engines from the list below by clicking on the x of the ones that are not real to remove them.


Search Engines

Remove the made up search engine names by clicking on the letter "x":

  • Dougle x
  • DogPile x
  • GigaBlast x
  • IceRocket x
  • HotHead x
  • Yahoo x
  • YouTube x
  • Brainboost x
  • Lycos x


Extension Task

Add another slide to your powerpoint with the title

Benefits of using different search engines

Explain the benefits of using more than one search engine


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🏁 Learning Objective 8 :- I can use internet search engines effectively, including using Boolean operators


stay safe from predators

Refining searches using Boolean expressions

Keywords are used to tell a search engine what information you are looking for. However, the resulting list of websites a search engine returns is often not quite what you want. Boolean expressions, such as AND, OR and NOT, allow you to make your search terms more specific.

Suppose you live in Manchester, and want to go to the cinema to watch a film. You might search for this information using the search term 'films'. This would generate millions of results, because the keyword 'films' is very common - lots of websites would mention that word.

Boolean expressions, such as AND, OR and NOT, allow you to refine your searches further:

The most common Boolean operators are AND, OR and NOT (always in capitals). They can be used to get more accurate search results.

  • AND narrows down the search by adding more keywords that need to appear in your results, eg The words 'black' and 'shoes' will return results that contain the words 'black' and/or 'shoes'. You may get results that contain only one of the two words, eg 'purple shoes for sale' or 'black T-shirts for sale'.
  • OR widens the search by including alternate words, eg 'film' OR 'movie'. The results will contain either of these words.
  • NOT excludes certain information, eg 'film' AND NOT 'Pirates of the caribbean'. The results will contain the word 'film' but not 'Transformers'. Some search engines use a minus sign in front of the word instead of NOT, eg - Pirates of the caribbean.
  • Quotation marks although not strictly a Boolean operator, quotation marks can be used to get more accurate results. For example, use 'black boots' to get results where the words 'black' and 'boots' appear together, eg 'black boots for sale'. By doing this, the result 'black shoes and purple boots for sale' will not be returned.

Task - Research

Find out about Dihydrogen Monoxide and write your opinion about it in a word document. Click on the link below to take you to the DHMO website



Extension task

Add another slide to your powerpoint with the title

Advanced Searches using google

Click on the link below to go to google advance search. Explain the benefits of using an advanced search over a normal search

Google Advanced Search »


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Teacher Date: 2019-11-18


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