The A340-200 is a wide-body, four-engine, long-range jet airliner that entered service in 1993. It was part of Airbus's first generation of four-engine jets designed to compete against the McDonnell Douglas MD-11 and early versions of the Boeing 747.
The "Why Four Engines?" Context:
In the early 1990s, twin-engine jets (like the A330 or Boeing 767) faced strict ETOPS (Extended-range Twin-engine Operational Performance Standards) regulations. They were not allowed to fly more than a certain distance (usually 90 or 120 minutes at the time) from the nearest suitable diversion airport. This made crossing vast oceans or desolate polar regions difficult or impossible.
The A340, having four engines, was immune to these restrictions. It could fly the most direct routes across any ocean or pole. Airbus used the marketing slogan: "4 engines 4 long haul." More information below.