It can be used in a few different contexts:
* To apologize: If you bump into someone or make a mistake, you can say "afwan" to apologize.
* To respond to a thank you: If someone says "shukran" (thank you), you can respond with "afwan" to mean "you're welcome".
* To politely decline something: You can use "afwan" to politely decline an offer, similar to saying "no thank you" in English.
So, the best English translation of "afwan" depends on the context!