Evidence

What is evidence? The question is always, not if something is general evidence or not, but evidence of what?
E.g. a locked computer file containing a confession may not work as evidence of the confession. It doesn't mean it's not evidence still. It may not be court evidence, but it's evidence. It's evidence that someone locked a computer file. Let's say it's a very advanced cryptolock, not commonly used. That's evidence to an investigator of something particular. So everything is evidence, because we live in a world of evident things. Of course, a lawyer in one country typically has a different understanding of formal evidence than in another, because the legal traditions differ per country.
See most generally: Philosophy