Search Technologies
Search Technologies
Learning objective
Onderdelen in deze les
Search Technologies
Learning objective
Learning Objectives
At the end of the lesson you will understand the function and structure of a search engine index. At the end of the lesson you will recognize how web crawlers contribute to search engines. At the end of the lesson you will be able to explain how search engines return relevant results. At the end of the lesson you will identify different ways to interact with search engines beyond typing keywords.
What do you already know about search engines?
Creating a Search Engine Index
A search engine uses a program to locate webpages based on user-entered keywords. It searches through an index, which is a database created and updated by web crawlers.
https://www.bbc.co.uk/bitesize/topics/zvxktcw/articles/znhmtrd#zrgybqt
Function of Web Crawlers
Web crawlers are automated programs that scan the internet and index webpages by recording URLs, keywords, and links.
How Search Engines Return Results
Search engines also rank the pages they find for you. They use an algorithm to identify the pages that are most useful and place these at the top of the list.
The algorithms use ranking signals to decide which webpages will be most useful to you. These signals include:
the number of links from other webpages to this webpage
the number of time the keywords appear in the text on the page (although too often is a bad thing)
the use of the keywords in the URL
how often the webpage is updated
Search engines rank pages using algorithms that consider factors like link popularity, keyword frequency, URL keyword use, and content updates.
Different Ways of Interacting with Search Engines
New search interactions include voice commands, image searches, language translation, and music identification.
Search Technologies Definitions
Search Engine: A program that searches for and identifies items in a database that correspond to keywords or characters specified by the user. Web Crawler: An automated program that scans the internet and indexes webpages by recording URLs, keywords, and links. Index: A database that a search engine uses to quickly find relevant webpages. Algorithm: A process or set of rules followed by a computer in calculations or other problem-solving operations, especially by a computer. Ranking Signals: Criteria used by search engine algorithms to determine the relevance and ranking of webpages.
Write down 3 things you learned in this lesson.
Write down 2 things you want to know more about.
Ask 1 question about something you haven't quite understood yet.
