An adverb used to ask about manner, state, degree, or to make suggestions (e.g., 'how', 'in what way', 'how about').
この料理、どう？おいしい？
How's this dish? Is it tasty?
明日の予定はどうする？映画に行く？
What shall we do about tomorrow's plan? Go to a movie?
パソコンの調子が悪いんだけど、どう直せばいいか分からない。
My computer is acting up, and I don't know how to fix it.