What do "Constraints" refer to in the context of Salesforce CPQ?

In the context of Salesforce CPQ, "Constraints" refer to rules that limit available options based on user selections. This ensures that when a user is configuring a product, the system presents only the valid choices that align with existing conditions, such as compatibility requirements or product dependencies. For example, if a user selects a particular item that is not compatible with another option in the configuration, the constraints will prevent that incompatible choice from being displayed or selected, thereby guiding the user towards valid configurations and enhancing the accuracy of the quotes generated. This functionality is crucial for streamlining the selling process and reducing errors in product configurations.