How Google analyses webpage content

Google divides a webpage content into 3 parts:

  1. Main Content (MC)
  2. Supplementary Content (SC)
  3. Ads

Quality of the webpage is determined by these three.

Main Content

Main Content is that part of content which directly helps the page achieve its purpose. We talked about identifying the purpose of a webpage in a previous blog.

The Main Content includes the title, description in any form (text, audio, video, tools). It can also include user-generated content like reviews, articles etc. Some pages would have tabs for additional information on the topic. These are also considered part of Main Content.

Here are some of examples that Google provides us:

Supplementary content

Supplementary Content contributes to a good user experience on the page, but does not directly help the page achieve its purpose. One common type is navigation links that allow users to visit other parts of the website.

Sometimes the easiest way to identify Supplementary Content is to look for the parts of the page that are NOT Main Content or Ads.

Some examples that Google gives:


This category of Ads is any content or links that are displayed for the purpose of monetizing the page. Note that, the presence or absence of Ads is not by itself a reason for a High or Low quality rating.

Importance of identifying different content

Google literally asks its Search evaluators to identify the 3 types of content on any webpage. This is important as the Main Content determines the purpose of the page. And purpose plays a key role in identifying the usefulness of the page, which in turn determines the ranking of the page in search results.

Here’s a snippet from Section 2.4 of Search Evaluator guidelines:

“On some pages, reviews may be considered MC, and on other pages they may be considered SC. Use your best judgment and think about the purpose of the page.

Do not worry too much about identifying every little part of the page. Think about which parts of the page are the MC. Next, look for the Ads. Anything left over can be considered SC.”

We’ll later talk more about how Google uses this knowledge about distinguishing types of content to help understand its usefulness.

– team

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