Using this article:

Kai Kang, Jinxuan Lu, Lingyun Guo, & Jing Zhao. (2020). How to Improve Customer Engagement: A Comparison of Playing Games on Personal Computers and on Mobile Phones. Journal of Theoretical & Applied Electronic Commerce Research, 15(2), 76-
92. https://doi-org. 10.4067/S0718-
18762020000200106
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1. Introduction:
A concise definition of a topic under consideration (this may be a descriptive or argumentative thesis, or proposal), as well as the scope of the related literature being investigated. (Example: If the topic under consideration is women’s wartime diaries’, the scope of the review may be limited to published or unpublished works, works in English, works from a particular location, time period, or conflict, etc.)
The introduction should also note intentional exclusions. (
Another purpose of the introduction is to state the general findings of the review (what do most of the sources conclude), and comment on the availability of sources in the subject area.