How do you know whether a detail is implicit?

if you are describing something that is clearly explained or expressed, the word to use is Explicit; if you are describing something that is implied, Implicit is the word.

So basically, if you aren't be specific about what it is you're talking about, it would be Implicit. If it were Explicit, you'd be specific about whatever it is you're doing or talking about.

people wont do this for 10 points you need at least 50