These databases are useful for research on topics related to education or children in general.
Peer review is the process by which articles are selected for publication in academic/scholarly journals. The articles are evaluated for accuracy, proper research methodology, and the correct interpretation and use of data by other experts in the field. No other publications undergo this level of vetting.
If you are looking for peer reviewed articles, there are a number of ways to locate them. One way is to limit your database searches to only articles in peer reviewed publications. Many databases allow you to do this. For example, most EBSCO Host databases have a box labeled "Scholarly" or "Peer Reviewed" in the limiters section under the main search boxes.
Primary article:
A primary article, sometimes called a primary resource, contains original research on a topic.
Review article:
A review article, sometimes called a secondary resource, summarizes research on a topic.