What does the identifier '$_1' signify in Qlik Sense?

In Qlik Sense, the identifier '$_1' is used to refer to the records or data associated with the current selection or state of the application. Specifically, it is often used in expressions and set analysis to indicate the data that is presently selected in the app.

The option you selected, which suggests that '$_1' refers to "one step forward," is not aligned with the actual function of this identifier. Instead, '$_1' represents the latest or current selection within the context of your analysis. This means it helps in calculating metrics or visual presentations based on the most recent user interactions with the app, updating results dynamically as further selections are made.

The other options present different interpretations, but they do not accurately capture the essence of what '$_1' signifies within the Qlik Sense environment. Understanding how '$_1' interacts with selections and data filtering is crucial for building effective data models and visualizations in Qlik Sense.