The Vietnamese word "đáp" has a couple of important meanings and usages that are useful for learners to understand.
To Answer / To Reply: "Đáp" is commonly used as a verb meaning "to answer" or "to reply." For example, if someone asks you a question, you would "đáp" by giving them an answer.
To Land: "Đáp" can also mean "to land," often used in the context of vehicles like planes or trains coming down to the ground.