What is the meaning and/or purpose of life? According to Buddhism, if exists, what is the meaning of life, and if different, what is the purpose of life? And where does this meaning and purpose come from?
I think that, in the zen soto tradition, the answer would be the famous word of Dogen Zenji: "あるがまま" (read: arugamama) which kind of translate as "things are so".

Zen encourage a radical acceptation of "things as they are", and it is believed that through this radical acceptance of "things as they are", right here, right now,  a deeper and non-intellectual understanding of life can be reached, one that words can't describe.

Therefore such question can not be answered. The Buddha himself simply remained silent when such metaphysical questions were addressed to him.