They will get on the roof and down in the crawl space, applicable. They leave no stone unturned in checking your new home. They will also make recommendations on things that you as a new home owner can do to improve and take care of your investment in the future. There is another type of inspection you have to have, especially here in the Ohio River Valley. That would be a termite inspection.
Most lenders require it.
For a small charge, it is one of the best investments you can make in your new large investment - your home.