a capacitor value magnitude doesn't suggest the application. The application suggests the magnitude. A 1000uF capacitor may be used for filtering, but it may also be used for other things, too, like timing, or rapid discharge (e.g. in a xenon strobe light, or a pulse laser). And a 0.1uF cap has many uses, and there are many types.
Thanks.
I have a BSEET.
I don't think the OP needs a whole class in electronics.
If the OP is asking this question do you think he needs to know about rapid discharge or xenon strobe lights ?