This is the 3383rd most frequent Japanese word.
概要
Summary; Overview.
In this sentence, '概要' is used to mean the summary or outline of the project, reflecting a general description.
このプロジェクトの概要を説明してください。
Please explain the overview of this project.
Here, '概要' is employed to signify the general understanding or fundamental details of the system.
新しいシステムの概要を知る必要があります。
We need to understand the overview of the new system.
In this usage, '概要' refers to a synopsis or abstract of the lecture that serves as preparatory information.