In this website it says:
A server cannot set a cookie for a domain that it is not a member of. In spite of this, users quite often find in their computer files cookies from web sites that they have never visited. These cookies are usually set by companies that sell internet advertising on behalf of other web sites. Therefore it may be possible that users' information is passed to third party web sites without the users' knowledge or consent, such as information on surfing habits. This is the most common reason for people rejecting or fearing cookies.
I have a question about the cookies I couldn't find the answer for. can cookies be set to connect to their creator's domain on their own? I mean like when the user only connected to the Internet and not necessarily is using the browser?
Or, can they automatically make contact to their domain when user is using the browser but not visiting that website or any other ad-based website?