Daum is a web portal in South Korea that offers many Internet services to web users, including a popular free web-based e-mail, messaging service, forums, shopping and news.
The Daum Context Keyword API finds important keywords within text and extracts them for users. The keywords can be used for applications such as contextual search, advertising via auto-tags and finding related documents.
The API uses RESTful calls and responses are formatted in XML, JSON and RSS. The site and documentation are in Korean.