Life is the state of being alive. It can take many forms, like humans, plants, fish, other animals such as reptiles and amphibians, trees, insectsbacteria and quite probably some other stuff.

Most living things cannot sustain life indefinitely and die in a process known as death.  Death can be seen as the opposite of life.

Most of the life that we know about is found on the Earth, but there is much speculation that other forms of life may exist elsewhere in the Universe, maybe even within our own Solar System.  Such putative lifeforms are known as aliens.

Of all forms of life on the Earth, humans are the best-known and most studied.  For this reason, the term life can often be used as a synonym for human life.