We purport to discuss the representation of explicit knowledge and its role in knowledge management as observed on relevant literature. The report begins with the description of how knowledge building in On-line environment takes place. Then it is followed by literature review of knowledge engineering. We also discuss the knowledge representation schemes and various forms of knowledge representation schemes and we discuss the literature which aims to throw light on when and how semantic web came into picture. Then we discuss emergence of the social web. Literature acknowledges the prime role of social media in representing the explicit knowledge and sharing it as well through certain types of forms of it. We have discussed the types of blog sites also as they are the key players in for letting people to express their knowledge in explicit form. We also discuss the Cases analysed for Comparative Study of Various Forms used in Representations of Knowledge.