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Subject gateways are services that provide access to Internet resources that have been reviewed, selected and described by subject specialists. The exact selection criteria largely depend on the perceived usage base of the gateway, but typically include factors relating to the content and presentation of the resource and the integrity of the information and site provider .Subject gateways are almost always based on the manual creation of descriptive metadata and usually provide end users with both search and subject-browse facilities.

The existence of rich metadata means that gateways can offer more sophisticated search options than other Web indexes. The application of subject classification schemes means that gateway services often provide hierarchical browse structures for browsing . As the Internet itself is constantly evolving, subject gateways also need robust collection development policies that include the regular checking and updating of resources included in the database.