주다 („juda“) means „to give“. -아/-어 주다 can be used to build an imperative is commonly structured as 주세요 (“please do for me”) in polite speech and 줘 (“do for me”) in casual speech.
Here some examples:
도와 주세요 → “Please help me.”
책을 읽어 줘 → “Read the book (for me).”
문을 닫아 줘 → “Close the door (for me).”
The -아/어 주다 structure is often used when requesting someone to do something for you or another person, adding a sense of kindness or favor to the request.