Launched November 26, 2011, Curiosity is a car-sized robotic rover sent to Mars as part of NASA's Mars Science Laboratory mission. The rover landed on the surface of Mars on August 6, 2012 to begin exploring the Gale Crater, taking tons of pictures and drilling holes into the surface to examine the geological make-up.
This was the fourth full drill hole which occured at a site called "Confidence Hills" on sol 759 (September 25, 2014). This is Curiosity's first drill hole into what the science team thinks are Mount Sharp rocks. The hole is 1.6 centimeters in diameter and about 6.7 centimeters deep. It is a merged-focus image product combining information from multiple images that MAHLI took from a position 5 centimeters away from the target as the camera stepped through different focal distances.