The Gemini program was a series of space missions conducted by NASA in the 1960s. It aimed to develop the technology and skills necessary for future human spaceflight, particularly for the Apollo program, which would eventually land astronauts on the Moon. Gemini missions included a variety of objectives, such as testing spacewalks and orbital maneuvers. The program featured a total of 12 crewed flights between 1965 and 1966, using the Gemini spacecraft. Each mission helped gather valuable data on human performance in space and contributed to advancements in spacecraft design and operation, paving the way for successful lunar exploration.