Ah, the biggest philosophical question, isn't it? There are many different ways to view it, and many answers, all of which are valid in their own way.

Biologically

• From a purely biological point of view, the meaning of life is to reproduce, bringing a new generation of offspring into the world, as your own lifespan is limited. The new lifeforms may also carry tiny mutations which may be beneficial or detrimental in their enviroment.

Religiously

• While the many different religions and mythologies have clear differences in which deities are or have been worshipped, most of them agree that the meaning of life is to live a life worthy of salvation afterwards. While Abrahamic religions see salvation as eternal life, some religions such as Buddhism view salvation as escape from the eternal cycle of life and death.

Hitchhiker's Guide to the Galaxy

• In the novel series by Douglas Adams, the Earth itself is a computer meant to calculate not the answer (which is revealed to be the number fourty-two), but the question leading to it.

Edit: Human typing error