A Website Changes Its Domain Name
There are several reasons why a website would decide to get a new URL but two of the most common ones are for rebranding or getting a stronger name. If a website changes even a single letter, character, number or even domain extension, this will affect all the other pages on it.
A Website Switches from HTTP to HTTPS
Google has long been letting users know the importance of adding extra security measures on their website, particularly the HTTPS setting. A lot of SEO experts believe that this has become an additional ranking factor in today’s Google algorithm. And although Google will never confirm this, we can pretty much say that HTTPS encryptions are going to be the standard for websites looking to rank well in the future.
All of the same considerations will apply for your domain if you decide to move from HTTP to HTTPS. The name of the domain is going to be the same but it will have an SSL certificate associated with it.