There are a few different motivations for sending humans to Mars, including aspirations of permanent colonization, scientific research and the pure achievement of successfully sending human beings to another planet. Some experts believe that humans should make temporary trips to Mars, while others, such as NASA astronaut Buzz Aldrin, believe that it would be better to send people on a one-way trip to Earth's planetary neighbor in order to establish a human colony on that planet.
Human curiosity about Mars, which is the closest theoretically habitable planet to Earth, has been active for decade. This curiosity is a major driving factor behind most of the ambition to send people to Mars. Others feel that it's only a matter of time before humans outgrow Earth and that the survival of our species depends on a mission to the Red Planet.
There are a few different theories on what people should do once they make it to Mars. Some people believe that these travelers should collect data and return, while others believe that humans should colonize the planet and begin growing food and engaging in other life-sustaining activities.