Space junk, or space debris, consists of defunct satellites, spent rocket stages, and fragments from collisions orbiting Earth. This debris poses significant risks, including collisions with operational satellites and spacecraft, which can create more debris and endanger astronauts. With millions of pieces of debris ranging from tiny paint flecks to large satellite parts, tracking by organizations like NASA and ESA is crucial to prevent accidents. Solutions include developing technologies for active debris removal, designing new satellites to deorbit themselves, and establishing international policies to manage and mitigate space junk, ensuring the sustainable use of space.