This book introduces the Search for Extraterrestrial Intelligence (SETI), discusses its origins, and explores various research methods and resources for enthusiasts. It assesses SETI’s scientific legitimacy and ideas over the past three to four decades, arguing for complementary efforts in interstellar travel, alien societies, and intelligent life. As well as this, it raises the question of whether life on Earth is from an alien system, discusses hypothetical scenarios for successful communication, and discusses the pros and cons of radio astronomy. This book also discusses the Drake equation and its significance in finding alien civilizations in the universe or multiverses, and explains evidential signals, distributed computing, AI algorithms, and data categorization techniques. This book proposes and debates on an estimation of SETI using hyperbolic chances and views SETI in connection with parallel universes, bubble universe collision and tetra toroidal form.