A database is a collection of information, in this case journal articles, arranged in individual records which can be searched by computer. Some databases also include conference papers, book chapters, reports, dissertations, books and other types of information.
Databases collect together articles in a subject area.
Databases allow you to search for articles using keywords. You can combine keywords or use a phrase to focus your search to find articles most relevant to your topic. Databases generally provide a reference or citation - enough information to allow you to find the article. Sometimes the full text of the article is also available. Periodicals are also called journals, serials or magazines.