What is the legal term for intentionally starting a fire or causing an explosion?

The legal term for intentionally starting a fire or causing an explosion is known as arson. Arson is characterized by the willful act of setting fire to or exploding buildings, vehicles, or other property with the intent to cause damage or destroy. This act not only poses significant risks to property but also endangers lives. The severity of the crime is reflected in the penalties associated with it, which can include substantial prison time, depending on the extent of the damage and any resulting injuries.

Negligence refers to a failure to take reasonable precautions, which is fundamentally different from the intentionality that defines arson. Vandalism involves the deliberate destruction of property but does not necessarily include the use of fire or explosions. Malpractice typically concerns professionals failing to meet standard care expected in their field, which is unrelated to fire or explosion-related incidents. Thus, arson stands out as the correct answer due to its specific focus on the intentional act of fire-starting or exploding.