A trade journal is a periodical that targets individuals working in a particular industry, trade or profession. They are often published by industry or professional associations. The articles focus on trends, best practices and events in that field. New practices and trends often appear in trade journals before they appear in scholarly journals.
Many databases include a checkbox that allows you to select the types of sources that will be included in the search results. It is usually in a list of items called "Publication Type," "Source Type," or "Content Type." Sometimes it appears in the area below the basic search box. If it isn't there, look at the search options available with the advanced search.