To create segments from a data extension simply, which tool should a marketer use?

Using Data Filters is the most straightforward way for marketers to create segments from a data extension. Data Filters allow users to dynamically segment data based on specified criteria without needing to write complex SQL queries. This functionality makes it accessible for marketers who may not have advanced technical skills but are familiar with the attributes in their data extensions.

Data Filters work by allowing the user to set conditions that the data must meet to be included in the segment. This can be based on fields within the data extension, such as demographics, purchase history, or engagement metrics. As a result, marketers can easily isolate specific groups of contacts for targeted campaigns without the need for intricate querying or manual manipulation of data.

While the other options may have their purposes in Marketing Cloud, they do not provide the same level of simplicity and user-friendliness when it comes to segment creation. Measures are generally used for aggregating and analyzing data, Groups are often utilized for organizing contacts but do not create segments directly, and Query Activities, while powerful for complex queries and detailed segmentation, require knowledge of SQL and are less intuitive for basic segmentation tasks.