Questions & Answers about Celý svět zná tuto píseň.
Czech does not use articles like a / an / the.
So:
Czech relies on:
- context
- word order
- demonstratives like ten, ta, to (this/that depending on usage)
That is why Celý svět zná tuto píseň naturally translates as The whole world knows this song, even though there is no separate word for the.