1. SEARCH ENGINES The World Wide Web contains a wealth of information, so much so that without search facilities it could be impossible to find what you were looking for. The first search engine was called Archie in 1990 which indexed pages and could handle about 150 Gigabytes of data, compared with the daily 20,000 terabytes that Google can process today

2. SEARCH ENGINES AO3 TASK To complete your project you will have to use the internet to find resources to include in your webpage. You are more than likely to use a ‘Search Engine’ to find this information. To complete this AO you will have to show your understanding of how search engines work giving examples of the different types available.

3. SEARCH ENGINES Investigate into the following different types of Search Engines:- WebCrawler's Directories Children's search engines Explain how these search engines work. Give at least TWO examples of these types of search engines. Present your work in Word Format

4. SEARCH ENGINES WEBCRAWLERS 1. Most popular type of search engine Examples Google Ask Jeeves 2. Search for ‘KEYWORDS’ 3. Automated bots - [spiders] crawl through the internet looking at each page for matches:-

5. SEARCH ENGINES WEBCRAWLERS 4. Looks at URL [Uniform Resource Locator] Address www.bbc.co.uk. www.bbc.co.uk 5. If the site has META TAGS the spider will keep a record of them to be shown 6. Look at contents of page for keywords. 7. Spider will send all this information back to the search engine database. 8.When you search - you will search the database for information.

6. SEARCH ENGINES META TAGS. The new description not only provides a number of keywords to the spider, it also offers a much more detailed description to potential customers browsing through search results. Able to rank the website to the relevance of the search This description would offer very limited information for the web spider and would be difficult to rank the relevance of the website to match the search These are codes written into the HTML code of the website by the web designer

7. SEARCH ENGINES DIRECTORIES. Examples Yahoo Yell 1. Websites register with the search engine so that they are included in their database. 2. Database is divided up into different directories [topic areas]. 3. Registered Websites are listed under whatever area or topic most suitable.

8. SEARCH ENGINES DIRECTORIES. 4. This means that the searches are more accurate and relevant. 5. Web crawlers can return web sites that include keywords that are not really relevant.

9. SEARCH ENGINES Disadvantages. 1.Require websites to register - can be time consuming. 2.Web crawlers do this automatically 3.Searches are restricted to the contents of the database 4.Searches are controlled with the directory headings or topic areas 5.Whereas web crawlers will return every page that includes the keywords in any order.

10. SEARCH ENGINES CHILDRENS Search Engines Example Askkids 1. Better control for children 2. Blocks unsuitable contents Eg An innocent search such as ‘Healthy Eating’ might find sites promoting anorexia or unhealthy eating. Children search engines would block these.

11. SEARCH ENGINES CHILDRENS Search Engines 4. With these search engines websites can be registered [directories] or crawled, but each will be checked for suitability. 5. Unfortunately new sites can take a long time to be registered because of the checking process. Therefore fewer results will be displayed than an ordinary search engine.

12. SEARCH ENGINES SEARCH USING WEBCRAWLERS Eg Google 688,000,00 hits

13. SEARCH ENGINES SEARCH USING WEBCRAWLERS Eg Google IBIZA Party - Suitable for Children???

14. SEARCH ENGINES SEARCH USING DIRECTORIES Eg Yahoo 279,000,000 Hits

15. SEARCH ENGINES SEARCH USING DIRECTORIES Eg Yell 10,308 hits

16. SEARCH ENGINES SEARCH USING CHILDREN SEARCH ENGINES Eg Askkids