All the details of the authors’ study are specified and often described in sections with the headings: Introduction, Materials and Methods, Results and Discussion.
Many review articles do not state a problem or hypothesis, no methodology, no findings or results of a specific study being conducted. Exceptions of this are systematic reviews and meta-analysis.
Use this chart to compare the different types of scientific articles you may find in a library database.
University of Illinois Undergraduate Library. "How to Read a Scholarly Article." YouTube, uploaded by University of Illinois Undergraduate Library, 6 Aug 2019, https://www.youtube.com/watch?v=2ZS1Beio11M
Western University Libraries. "How to Read a Scholarly Article." YouTube, uploaded by Western University, 26 Apr 2012, https://www.youtube.com/watch?v=3SmOq6gENPM