Which activity is primarily used to extract structured data from a document?

The activity used to extract structured data from a document is data scraping. This method is specifically designed to pull data from structured formats, such as tables or lists, found within web pages or documents. Data scraping utilizes various selectors and patterns to identify and retrieve multiple data points efficiently, making it ideal for scenarios where the information is organized in an easily definable structure.

In contrast, screen scraping is generally more suited for unstructured data extraction where the information displayed on a user interface may not have a consistent format. Invoke Workflow is used to call another workflow and does not focus on data extraction in itself. Read PDF Text is intended for extracting plain text from PDF documents but is not structured data extraction; it simply retrieves text without formatting or structure that would typically be needed for more detailed data analysis. Thus, data scraping stands out as the most appropriate choice for extracting structured data effectively.