Final answer:
A blitzkrieg is a rapid invasion by air and land, involving a swift and overwhelming attack to quickly overcome the enemy. Germany's invasion of Poland in World War II is a notable example.
Step-by-step explanation:
The best definition of a blitzkrieg is a rapid invasion by air and land. It is a military tactic that involves a swift and overwhelming attack to quickly overcome the enemy. One example of a blitzkrieg is Germany's invasion of Poland in World War II, where they combined air bombings and ground forces to quickly capture and control key areas.
Learn more about Blitzkrieg