A Boolean statement is a logical proposition that is either true or false. Logical statements can be linked together using operators (such as AND, OR, NOT, NAND, NOR, -->, and <-->). The system uses these operators to decide how to process the Boolean statements.

When you link statements together, you form a combined statement. Each individual statement in a combined statement is assigned either the value TRUE or FALSE in a truth table. Which truth value (TRUE or FALSE) the combined statement receives depends on the operator.