Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
Q&A for work
Connect and share knowledge within a single location that is structured and easy to search.
When using Google Search, there was a section of ads labelled with "Ads not from this site"
Is it normal?
Well these Ads seem to be coming from some extensions or plugins you are using for chrome, try searching for the same keyword on some other browser to make sure that these ads are not from google (most probably they are not from google).
Required, but never shown