The home inspection is divided into a few basic categories, which are the structural system, the electrical system, the HVAC (heating, ventilation and air conditioning), the plumbing system, and the appliances.   There are some houses that have other components, such as a pool, or other types of inspections, such as a termite inspection, that are not part of the standard inspection of a house.  These can be scheduled but are an additional cost.  

The home inspection is a thorough inspection, but there are limits of what an inspector can do.  There may be locked doors, or damage that is not visible.  No destructive testing can be done, so drywall cannot be cut and removed to see what is behind it.  A roof may be too steep or too wet to climb onto for a close up inspection, for example.  Instead, the inspection would be done from the ground with binoculars.