Burglary is the intent to break into a building without consent with the intent of committing a crime inside (including theft). Burglary is a specific intent crime, requiring that the burglar knowingly intend to commit a crime while inside. A person does not have to forcibly enter a building to commit burglary; going in through an unlocked window or door can still fulfill the “breaking” element of burglary.
Robbery is another specific intent crime, requiring both theft and a form of violence or threat of violence used to deprive someone of their property. The most common example of a robbery is a convenience store holdup, in which a robber threatens to shoot a cashier unless the cashier hands over the loot.
In the event of a break in when the intruder is still on the premises:
In the event a theft is discovered after it occurred and/or later date: