An emerging trend has been observed in the Trust and Reputation (T & R) systems in field of decision-making support for a majority of the provisions propagated by the Internet. It is the extreme importance that peers (users) are able to trust each other and rely on them for file sharing and for services. This paper provides the reader an apprehensive and completely true information and details on a large number of the present conceptions, proposals, issues, and the key to those problems in VANETs and other fields to enhance the eminence of the data in transportation through a systematized literature review. Trust and reputation have also been discussed gravely in this paper. After the scrutinized analysis of more than 90 articles related to trust in a plethora of fields, extracted from few of the apt scientific sources ((i.e., SIEEE Computer Society, ACM Digital Library, Springer Link, Science Direct, and Wiley Online Library), and hence, succeeds to bring about the major hurdles and necessities for trust in real world and future research.