Boolean expression: A boolean expression is an expression that evaluates to either true or false. It's commonly used as the condition in an if statement.
Nested if statements: Nested if statements are when you have multiple layers of if statements inside each other. They allow for more complex decision-making processes.
if-else-if ladder: An if-else-if ladder is when there are multiple conditions to check, and each condition has its own corresponding block of code to execute.