Class B Airspace is a type of controlled airspace that surrounds major airports. It is designed to manage high-density air traffic and ensure safe operations for both commercial and general aviation aircraft. The airspace typically extends from the surface up to 10,000 feet above sea level and is shaped like an upside-down wedding cake, with different layers for various altitudes. Pilots must obtain permission from air traffic control to enter Class B Airspace. This requires a specific clearance, and pilots must also have a valid pilot certificate and meet certain equipment requirements, such as having a functioning transponder.