Human spaceflight missions involve sending astronauts into space to conduct research, exploration, and technology testing. These missions can take place in low Earth orbit, such as aboard the International Space Station (ISS), or further into space, like the Moon or Mars. These missions are crucial for understanding the effects of space on the human body and for developing life-support systems. Notable programs include NASA's Apollo program, which landed humans on the Moon, and the ongoing Artemis program, aimed at returning humans to the lunar surface and eventually exploring Mars.