How can a file be 0 bytes?

I'm curious, how can a file possibly have a size of 0 bytes? It seems counterintuitive that a file, which is essentially a collection of data, would not contain any data at all. Is it possible for a file to exist without any information within it? And if so, what practical applications might such a file have? Additionally, could there be any security concerns associated with having a 0-byte file on a system or network? I'd love to understand the technical underpinnings of this concept and how it relates to the broader world of digital storage and data management.