Web Design/Internet Essentials. Search Engines and Searching the Web. Search Engines. Search Engine Basics Formulating Searches. The Web and E-mail. 2. Search Engine Basics.
Search Engines and Searching the Web
The Web and E-mail
A Web search engine is a program designed to help locate information on the Web by formulating simple keyword queries.
a web crawler
an indexing utility
a query processor
Web crawler: combs the web to gather data
Indexing: processes the information gather by the crawler
then stores key terms and URL’s in a database
Query processor: allows you to access the database by entering keywordHow do search engines work
Most search engines are not case sensitive
(Shift key usage not necessary)
Search engines ignore common words like:
(and, a, & the) there is no need for them.
To search for an exact phrase, enter it in quotation marks.
When you enter multiple terms the query processor assumes you want to see web pages that contain all of your terms.
The asterisk (*) is referred to as the wildcard charter.
A Boolean operator is a word or symbol that describes a relationship between keywords,
Helps you create a more focused query
Ex.1 poverty and crime Ex.2 poverty and crime and gender
Ex.3cats not dogs Ex.4 cats or felines
Example 1: +dyslexia +adults
Example 2: radiation -nuclear
Most search engines work with keyword queries in which you enter one or more words
Ex. Mountain Bike
Open your browser and go to the website below and watch:The Animated Internet: How Search Engines Work http://www.learnthenet.com/ENGLISH/animate/search.html