Interstellar travel is the hypothetical journey of spacecraft between star systems, confronting distances thousands of times greater than those within the Solar System. Current propulsion makes such trips impractical within human lifetimes; even Voyager 1 would need 75,000 years to reach Proxima Centauri. The article explores immense energy requirements, hazards from interstellar dust and radiation, and human factors like isolation and long-duration life support. It surveys a zoo of propulsion concepts—fusion, antimatter, beamed sails, nuclear pulse drives, ramjets, even artificial black holes and warp drives—plus real design studies and organizations. It concludes that interstellar flight is technically imaginable but energetically and economically daunting.