The Lunar Module (LM) was a spacecraft used during the Apollo missions to land astronauts on the Moon. Designed by NASA, it had two main parts: the descent stage, which allowed it to land on the lunar surface, and the ascent stage, which helped astronauts return to the orbiting Command Module. The Lunar Module was crucial for the success of the Apollo program, particularly during the historic Apollo 11 mission in 1969, when astronauts Neil Armstrong and Buzz Aldrin became the first humans to walk on the Moon. Its unique design enabled it to operate in the Moon's thin atmosphere, making lunar exploration possible.