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Indexing is the process by which search engines like Google and Bing access websites,
they read them, interpret them and organize them in their databases
so they can offer them as search results to users.
Search engines use programs called "spiders"
that access websites and track them.
"Spiders" read each page, navigating throughout the website,
moving through it page by page using the links it finds.
As they do this scan, they organize the information.
Each search engine has their own mysterious ways to do this job.
That's why they understand the websites differently, and give different results.
The contents "spiders" can read are quite diverse.
During the indexing process, "spiders" from search engines
track all the files found in the webpage.
These can be pages with text, images, PDF documents,
XMLs, ratings made by users on the page, videos...
However, there are files that cannot be tracked such as JavaScripts,
iframes or Flash animations, although there are methods to optimize animations.
An idea that we have to keep in mind about indexing?
Indexing is similar to the process a librarian would make.
They receive the contents, understand how to catalog them so that when someone searches for something specific
they always know how to give the best possible result.