Several parts combine into one character.

答 is a phonetic-semantic compound: ⺮ (bamboo radical) + 合 (hé, "to fit / join / match"). The composite captures an entire scene from ancient East Asian correspondence: messages were written on bamboo slips (竹簡 zhújiǎn / 죽간 jukgan), and a reply involved sending another bamboo slip whose contents would "match / fit" the original — answering question with answer, query with response. The character preserves the technology of pre-paper writing: bamboo strips bound together as the medium of correspondence.

Korean reading "dap." 答辯 (dapbyeon, formal reply / defense — used in legal and parliamentary contexts), 解答 (haedap, answer / solution to a problem), 問答 (mundap, Q&A — Buddhist debate format and educational practice), 應答 (eungdap, response — used for emergency responses and customer service), 正答 (jeongdap, correct answer — central to Korean exam culture), 誤答 (odap, wrong answer), 報答 (bodap, reciprocation / gratitude — repaying kindness).

Mandarin dá, 2nd tone (with secondary reading dā in some compounds). 答 (dá), 回答 (huídá, to answer / reply), 答案 (dá'àn, the answer / solution), 答复 (dáfù, formal response). The lighter dā tone appears in 答应 (dāying, "to agree / promise / respond" — used in casual speech: 他答应了 tā dāying le, "he agreed"). The two pronunciations carry different registers.

Japanese on-reading トウ (tō) — 解答 (kaitō, answer / solution), 問答 (mondō, Q&A — also the format of Zen koan exchanges), 応答 (ōtō, response), 正答 (seitō, correct answer). Kun-reading こたえる (kotaeru, "to answer") — 答える (kotaeru, to answer), 答え (kotae, the answer — noun). The verb 答える pairs naturally with 問う (tou, "to ask"), creating the symmetrical ask-answer pair central to Japanese conversation patterns.

Memory aid: bamboo (⺮) plus matching (合) — bamboo slips matched in correspondence = answer.