Many SQL Server Management Studio (SSMS) users connect to the same SQL Server instances over and over. In some organizations, the number of instances can be large, which makes flipping through a long list of instances in the Connect to SQL Server dialog cumbersome. I don’t have a huge list, but I do have a few, as you can see in the image below.
Many users will create a custom list of registered servers that they have handy in the SSMS window on the side. These are custom to each installation, but teams may want to share their lists