At about 100 km from the surface of the Moon, the spacecraft will decelerate and perform a manoeuvre called Lunar Orbit Capture – a complicated and extremely difficult series of moves which would result in the spacecraft being caught by the Moon’s gravity and settling into an orbit around the Moon.
Then at an opportune time, optimised to makes sure that the soft landing coincides with the lunar dawn, the spacecraft thrusters will be fired to decelerate and decrease the orbit, closer to the surface of the Moon. Landing is completely autonomous, and will be controlled by software on board the spacecraft which would use data collected from laser sensors to guide the spacecraft as it decelerates and descents.
The landing site is Mare Imbrium, latin for Sea of Showers, and is a vast dusty plain on the Moon. Landing at the crack of the lunar dawn helps ensure that the Mission can make the most of the lunar day.