을/를 are particles that mark the object of a verb in Korean.
When to use
Marking object, Used with verbs, Questions and commands
The nuance
1. 을/를 mark the direct object of a verb. 2. Attach '을' after nouns ending with a consonant, and '를' after nouns ending with a vowel. 3. They clarify the target of an action. 4. They differ from subject markers 은/는 and 이/가. 5. Used to emphasize the object in questions or commands.
