Function of the site: operator

The Boolean operator site: allows you to search for your documents among those of a specific domain name.

The Boolean site operator: concentrates a search for information on a specific domain name. Only the documents present on this domain name and presenting the searched terms will be brought up in the results of your search. This operator helps to specify a search by limiting the documents obtained. 

"quantum computing" OR "super computing" site:scholar.google.com

In this example, the search will be done among the documents published on Google Scholar.com

It is possible to couple this operator with the exclusion boolean (-) to remove a domain name from your search. This can be used when you are doing a search on yourself and do not want to include your own domain name.

"quantum computing" OR "super computing" -site:IBM.com