What are simple expressions in NetSuite used for?

Simple expressions in NetSuite are primarily used for creating criteria segments within searches and for manipulating those criteria using additional Boolean operators. By using the "use expressions" feature, users can apply systematic logic to segment data more effectively, allowing for refined searches that yield more accurate and useful results. This functionality is especially important when users need to filter or categorize records based on specific conditions, thereby enhancing the capability to analyze data effectively.

The other options revolve around different functionalities within NetSuite. While charts and graphs are indeed created from records, they do not specifically relate to the purpose of simple expressions. Defining user permissions is a separate administrative function that does not involve expressions or search criteria. Gathering analytics on sales performance pertains to overall reporting and analysis tools, which also do not directly connect to the functionality of simple expressions in search criteria segmentation.