What is the purpose of a calculated column in Power BI?

A calculated column in Power BI serves the specific function of enhancing your dataset by adding a new column that is derived from the calculations performed on existing columns within the table. This capability is essential when there is a need to derive additional information or metrics from the current data, such as combining values, performing arithmetic operations, or applying conditional logic to create more insightful visuals and analyses.

When you define a calculated column, you essentially extend your data model with new values that are computed row by row based on the expressions you specify. This allows for greater flexibility and deeper analysis, as users can then utilize these new values in reports and dashboards without having to modify the original data source.

The other options do not accurately reflect the function of a calculated column. For instance, removing duplicates relates to data cleansing processes, creating interactive visuals is more about report design and user engagement, and sorting data pertains to the organization of data rather than manipulation or enhancement of data fields themselves. Calculated columns are specifically designed for adding value through computation.