Knowledge iN (Korean:지식iN) service of Naver, which is currentl the biggest web portal in Korea, is an information-sharing tool for Naver users.

Its include various kinds of the questions and answers from their users, such as cooking tips, Science, sports, business information, so on. Its is similar to Yahoo! Answers. Naver have huge database of the questions and answers in Knowledge iN, is the most successful model of Q&A service.

Knowledge iN has four sub-categories :

Knowledge Q&A: contains all the general questions about anything

Local Q&A: include questions about Local information like good restaurants, cheap stores, and real estate information.

Agony Q&A: questions about relationship, love, career advise, sexual question at puberty (with anonymous posting enabled.) While answers on Knowledge Q&A and Local Q&A is factual, answers on Agony Q&A is usually opinionated.

Open Dictionary: is a database of informative articles generated by users. Users can create an article alone, or one may enable other users to collaborate to create a thread of articles on the same subject. In addition, the user may add one's answer from Knowledge Q&A to Open Dictionary.

Reference: Naver.com (http://kin.naver.com/), Webcertain.com (http://www.webcertain.com/korean-search-engines.html)