What is the Maginot Line?

This is the first time that I hear about the Maginot Line. The Maginot Line was a vast fortification that spread along the French and German border, but became a military liability when the Germans attacked France in the spring of 1940. This line is named Maginot Line because the Minister of War was Maginot, and he gave the financing for the construction of this line.  The construction of the Maginot Line started in 1922 and it was finished in 1936. In 1939 the line was elongated from Switzerland up to Luxembourg. The line didn’t avoid the defeat of France at the beginning of the Second World War in 1940, because the Germans surrounded the Maginot Line for through its western extremity.