Simple tags contain single-line statements that declaratively state the content that is output as a result. Simple tags follow this format:
Use simple tags to display content from data sources. Each attribute of the data source, such as a data extension or a user-defined data source, is available using the name of the attribute. Reference the name with a simple declarative statement.
For example, Guide calls the data from a data source with an attribute of FirstName using this simple tag: