Subject Gateway is an organized collection of resources on a given subject along with a retrieval mechanism. This is essentially means that the scope of the search domain is well defined and limited to a subset of what exists in general. In the simplest form, the resources may be made available as a structured hyper-linked directory as followed by some of the search engines sites that offer directory services. The structuring followed is mostly only by broad subject areas. But for arranging topics under research areas where the intension of the subject areas is narrow and specific, broad directory structuring would not serve the purpose. Representation of subjects to that extent involves deploying various skills in the area of secondary information work such as document description, classification and derivation of subject headings Subject Gateways is allowing links amongst electronic resources stored on services dispersed geographically on distant locations. The gateways sites redirect a user to the holders of the original digital material. A subject gateway can be defined as facilities that allow easier access to web-based resources in a defined subject area. The simplest types of subject gateways are sets of web pages containing list of links to resources. Some gateways index their lists of links and provide a simple search facility. More advanced gateways offer a much enhanced service via a system consisting of a resource database and various indexes,   which can  e searched and / or browse throughout a web based interface.