An Electronic Journal (or E-journal) is a traditional journal that is in an electronic format; either because it was originally created that way, or because someone took a print journal article and scanned it to make it available electronically.
A Database is what is created when a large number of electronic journals are put in one place and a search interface (usually a search box) is added to help find what you need. Both databases and electronic journals can be subject specific. When you have a database that only has the title or abstract, but not the full text, it is usually referred to as an Index.
Databases are great sources for finding information for your research paper. In the databases, you will find peer-reviewed or scholarly articles for your research. Journal Articles and Newspapers can be useful because you may find information on a topic that is so specific that no book has been written about it (and they may be more timely, since it takes some time to publish a book.)
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