Koreans use it to agree with what someone said.
Yes. "맞아요 (majayo)" is polite and natural. You can also say "맞아 (maja)" casually.
You can say "That's right, exactly" — 맞아요, 정확해요 (majayo, jeonghwakhaeyo).
맞아요 means "That's right / Correct." 맞다 (matda) = to be right/correct, 아요 (ayo) = polite. Very common way to agree in Korea - conversations, meetings, listening to friends.
1. Agreement: Correct info.
2. Meetings: Confirm.
3. Daily: Acknowledge.
That's right. Exactly.
That's right, exactly.
Right, totally. (Casual)
That's right, it's exact. (Formal)
• 그래요 (geuraeyo) - That's so
• 그렇죠 (geureochyo) - Exactly
• 정확해요 (jeonghwakhaeyo) - Exact