This document summarizes a research article from the Iranian Journal of Information Processing and Management. The article examines the relationships between ontologies and social tagging as new ways of organizing and sharing knowledge online. It explores how ontologies and social tagging can help promote one another, despite their differences. The research was conducted using a library-based conceptual approach, studying both print and electronic resources. It finds that tags can be used in the semantic web and ontologies in web 2.0 to address weaknesses in organizing and retrieving information. The use of tags in ontologies and ontologies in web 2.0 can make them more functional and accepted by users.