Yes, any garage that does not share a wall with the home is detached. A completely detached garage also does not have a continuous roofline attaching it to the home. Detached garages that do connect to the home by a continuous roof are often referred to as an "attached detached garage". They are attached to the home by the continuous roofline, but are still a separated building with no common walls connecting the garage to the home. In our MLS we have fields for all three types of garages: --attached --detached --attached-detached
An attached garage is attached to the house - you drive in your garage and have access to the house through the garage. Attached garages can be on the side, the back, the front, etc.
A detached garage is separate from the house, usually back. You have to physically walk out of the garage to the home.