this world; this life; the land of the living
Often contrasted with あの世 (the afterlife). Used in both everyday and literary contexts.
See also: あの世
I'm grateful to have been born into this world.
彼はこの世を去った。
He passed away (left this world).
He has never been sick since he was born into this world.
She is the most important person in this world to me.
Don't look like it's the end of the world just because you failed one exam.