Final answer:
Boolean expressions are tested by the if statement and evaluate to either true or false.
Step-by-step explanation:
Expressions that are tested by the if statement are called boolean expressions. A boolean expression is an expression that evaluates to either true or false. In other words, it represents a condition that can be either satisfied or not satisfied. When the condition is satisfied (evaluates to true), the code inside the if statement is executed. When the condition is not satisfied (evaluates to false), the code inside the if statement is skipped.