Using the question word Woher? and aus

Woher* = where from, from where

Woher is regularly used with kommen (to come) and sein (to be) and others. This is very similar to English.

*Sometimes you may hear Woher split in two. There is no difference in meaning.

To say aus indicating origin (from) with countries that are feminine, such as "die Schweiz" and "die Türkei", you should say aus der:

To say aus indicating nationality with countries that are plural (such as die USA and die Niederlande) you should say aus den:

Ich komme aus den USA.
Ich bin aus den Niederlanden.
- Notice that you also add an -n to Niederlande.

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