Insights are often considered the ideal outcome of visual analysis sessions. However, there is no single definition of what an insight is. Some scholars define insights as correlations, while others define them as hypotheses or aha moments. This lack of a clear definition can make it difficult to build visualization tools that effectively support insight discovery. In this paper, we contribute a comprehensive literature review that maps the landscape of existing insight definitions. We summarize key themes regarding how insight is defined, with the goal of helping readers identify which definitions of insight align closely with their research and tool development goals. Based on our review, we also suggest interesting research directions, such as synthesizing a unified formalism for insight and connecting theories of insight to other critical concepts in visualization research.

翻译：洞察通常被视为可视化分析会话的理想输出结果。然而，关于什么是洞察，目前尚无统一定义。一些学者将洞察定义为关联关系，而另一些学者则将其视为假设或"顿悟时刻"。这种明确性的缺失使得构建有效支持洞察发现的可视化工具变得困难。本文通过全面的文献综述，系统梳理了现有洞察定义的全貌。我们归纳了洞察定义中的关键主题，旨在帮助读者识别哪些洞察定义与其研究及工具开发目标最为契合。基于文献分析，我们还提出了富有前景的研究方向，例如构建统一的洞察形式化体系，以及将洞察理论与可视化研究中的其他关键概念建立关联。