what is Crawler and how google search are work

1. Prepared By :
Ali Adil

2.  What is Crawler?
 How to control Crawling?
 How Google Search is working?

3. Crawler
Index
 takes the content from crawling.
 rank pages.
Is a software program using to follow
links and gathering information.

4. How to control Crawling?
 sitemaps
 robots.txt

5. sitemaps
2- Last modification
1- Home page
3- Change frequently
4- priority
Sitemaps are XML file that can help
crawler to understand websites.

6. How Google Search is working?
check the words in the search.
2- Matching search
1- Analyzing words
find all information that matches your words.
3- Ranking useful pages
4- Returning the best results
to help searcher they rank all pages.
after ranking systems google delivers the best results to the searcher.