Probably a zillion developers have written this small sentence another zillion times, and most likely never realized what that sentence is actually saying. To say hi to the world means birth, the start of something new, still full of potential, with so much awe to be discovered.
It is not clear from where “hello world” originated, wiki says 1967 from the language B (BCPL), I guess that was the language preceding C. Anyway, let’s not get distracted, let stay with the magic – hello world!