Relational operators perform a comparison between two values and return a Boolean value (True or False) as a result of the comparison. The following screenshot shows the relational operators in Blueprints:

The following screenshot shows an example with a relational operator, assuming these Actions are performed when a game object receives damage. A Branch node is used to test whether the Health variable value is less than or equal to 0.0. If it returns True, then this game object will be destroyed: