e-Resources (aka databases or academic search engines) are what you use to find online articles. Although you can use the Library Catalog to find articles, there are several good reasons to go directly to specific e-Resources to do your research:
1. Some images, newspaper articles, and statistics cannot be found on the Catalog.
2. Database interfaces enable you to construct more precise searches.
3. Most databases have filtering features to help narrow down your results (e.g. limit results to only articles from The Wall Street Journal).
4. Many databases have additional useful features (e.g. RSS notifications for specific journals or searches).
For assistance on how to use a specific database, feel free to Ask-A-Librarian.