The term "extraterrestrial life forms," or "ET life," refers to organisms or entities that are not native to Earth and exist elsewhere. For millennia, the study and discovery of extraterrestrial life forms has captivated the attention of scientists and sparked curiosity about the universe, inspiring travels beyond Earth.

There is currently no direct proof of extraterrestrial life forms, despite massive exploration attempts. On the other hand, the likelihood of life existing elsewhere is strongly suggested by the universe's vastness and diversity of settings.

The main method used by scientists to look for extraterrestrial life is to investigate places in our solar system like Mars, Europa, and Enceladus where there may be microbial life. In order to find possibly habitable worlds, telescopes are also used to investigate exoplanets, or planets circling stars outside of our solar system.

Diverse theories exist on the possible forms that alien life could assume. According to some scientific theories, microbial life could be abundant and found in the atmospheres of gas giants, behind the icy crusts of moons, and beneath the oceans below the surface.

Some people conjecture about the existence of more sophisticated life forms, which might include completely distinct biochemical systems or sentient entities with the ability to communicate. .