Are two domain names bound to one website?

Does it take the time to bind two domain names or multiple domain names to the same website, is it equivalent to multiple websites participating in the ranking at the same time? In some ways this kind of thinking makes sense.
But because search engines struggle with website cheating all the year round,Adhere to the protection of copyright interests, so for web pages with the same content, one must be identified as the main and the other
For times. And often in the process of judging the primary and secondary, search engines will be confused and often confused, which has caused the phenomenon of inclusion and ranking in different situations, thus creating
Became a dispersion of weights.
I would like to add here that the above is only for the case of webpages, and if it is a website, two identical websites have great suspicion of copying in the eyes of search engines,
It is very likely to be punished for being suspected of cheating. Similarly, binding two or more domain names to a website is like doing two identical websites, and search engines cannot judge
Which one is the primary domain name and which is the secondary domain name is very detrimental to the weight of the website. But what if we have two domain names and we must bind them to a website?
My suggestion is: Identify a primary domain name, push it to the website, and transfer another domain name 301 to the primary domain name. This has many advantages, not only makes it easier for search engines to judge
Disconnect the primary and secondary, and also transfer the weight of another domain name to the primary domain name, which will not cause waste.