What does it the mean by 'life the universe and everything'?

Answer 1

42.

This was the question posed to a super computer, Deep Thought by name, with a brain the size of a planet and after zillions of years of cogitation, the above was the answer given to the question.

Answer 2

"Life, the Universe, and Everything" is a phrase popularized by Douglas Adams in his book "The Hitchhiker's Guide to the Galaxy." In the book, a supercomputer called Deep Thought calculates the answer to the ultimate question of life, the universe, and everything, and the answer is revealed to be the number 42, much to everyone's confusion and amusement. It has since become a popular cultural reference point for questions about the mysteries of existence.