What is the difference between 1st and 2nd degree burglary?

First-degree burglary is the burglary of an inhabited house or dwelling.  First-degree burglary is always a felony in California.  Second-degree burglary is commonly referred to as commercial burglary.  Second-degree burglary includes all burglaries that are not first-degree.

The most common type of second-degree burglary is theft from a retail store.