Not all scholarly articles are the same. In fact, there are several different types of scholarly articles:
Scholarly articles contain the following components:
One of the cornerstones of science is 'peer review', also known as 'refereeing'. Peer review is the process whereby an article is assessed for quality by his or her peers (experts working in the same field) before it's published. Articles that have undergone peer review are called 'peer reviewed' or 'refereed'. The peer review process is used by most scholarly journals.
Watch this short video to learn how peer review works:
Book reviews published in scholarly journals are typicallly NOT peer reviewed.