Outline What are Search Engines Technical terms associated with SE Basic Web Search Engine Types of Search Engines Working of Search Engines Directories Crawler based Search Engines SEO
…..cont’d Keyword Search Operators Various search Engines Comparison Searching Technique 10 Do’s and Don’ts while Searching
What are Search Engines? A search engine is a sophisticated piece of software, accessed through a page on a website that allows you to search the web by entering search queries into a search box. The search engine allows one to ask for content meeting specific criteria and retrieving a list of references that match those criteria. Search engines use regularly updated indexes to operate quickly and efficiently.
Technical terms associated with SE Crawling – Follow links to find information Indexing – Record what words appear where Ranking – What information is a good match to a user query? Displaying – Find a good format for the information Serving – Handle queries, find pages, display results
A. Frank-T.Sharon 6 Basic Web Search Engine Administrator Users Search Engine Search Engine Retrieval Gathering WWW database
Types of Search Engines Basic Search Engines assembled by software -- automated "spiders" or softbots. Directory/Guide Hierarchical list of subject categories -- assembled by people (“humanly-compiled”). Meta-Search Engines Uses several basic search engines in parallel. Special(ty) Search Engines/Tools Dedicated to a focused domain/community/media. Popularity Search Engines Use popularity link/usage analysis.
Working of Search Engines Directories Crawler-based search engines
Directories Unlike search engines, which use special software to locate and index sites, directories are compiled and maintained by humans. Directories often consist of a categorised list of links to other sites to which you can add your own site.
Crawler based Search Engines Crawler-based search engines use sophisticated pieces of software called spiders or robots to search and index web pages These spiders are constantly at work, crawling around the web, locating pages, and taking snapshots of those pages to be cached or stored on the search engine’s servers They are so sophisticated that they can follow links from one page to another and from one site to another
Crawlers based Search Engines Google is a prominent example of a crawler-based search engine. Yahoo features both directories and crawler-based search engines. Metadata Metadata Metadata Metadata Metadata Metadata Crawlers collecting data
Searching Techniques Proximity Searching Ability to specify how close within a record multiple terms should be to each other Phrase Searching Requires terms to be in the exact order specified within the phrase markings. The default standard for identifying phrases is to use double quotes (" ") to surround the phrase.