Define "burglary" under the Penal Code.

The definition of "burglary" under the Penal Code is best captured by the concept of unlawful entry to commit a crime inside. This definition encompasses not only the act of entering a structure without permission but also the intention to engage in criminal activity once inside.

Burglary is characterized by the specific intent to commit a crime, which can include theft, vandalism, or other felonious acts. The focus on unlawful entry highlights that simply entering a property without permission (as mentioned in another option) does not alone constitute burglary unless there is the intention to commit a crime. Therefore, it is the combination of unauthorized entry and the intent to commit a crime that solidifies the crime of burglary.

While other options touch on elements related to burglary, such as breaking and entering or stealing, they lack the complete definition that includes the critical aspect of intent which makes "unlawful entry to commit a crime inside" the most accurate definition in the context of the Penal Code.