Indexing

After a page is crawled, Google tries to understand what the page is about

it includes processing and analyzing the
textual content and
key content tags
attributes, such as <title> elements
and alt attributes such as images, videos, and more.

During the indexing process,
Google determines if a page is a duplicate of another page on the internet or canonical.
#myquestion Wtf is a canonical

Google also collects signals about the canonical page and its contents,
which may be used in the next stage, where we serve the page in search results.
Some signals include
the language of the page,
the country the content is local to,
the usability of the page
and so on.

The collected information about the canonical page and its cluster may be stored in the Google index,
However, Indexing isn't guaranteed; not every page that Google processes will be indexed.