What is a Supermoon?

English: The "Supermoon" of March 19, 2011 (right), compared to a rather "average" moon of December 20, 2010 (left): note the size difference. Images by Marco Langbroek, the Netherlands, using a Canon EOS 450D + Carl Zeiss Jena Sonnar MC 180mm lens. (Photo credit: Wikipedia)

It is when the moon is really close to the earth and is either a New Moon or a Full Moon.

There will be 5 super moons in 2014.

"Richard Nolle, is credited with coining up with the term supermoon. He defines them as:
. . . a new or full moon which occurs with the moon at or near (within 90% of) its closest approach to Earth." ('Supermoon' kicks of 2014 | WCNC.com Charlotte)