What will happen if the expression in an if statement evaluates to false?

When an expression in an if statement evaluates to false, the block of code within that if statement is skipped entirely, and effectively, no action is taken in that context. The program continues to execute any subsequent lines of code following the if statement, but the specific instructions contained within the if block will not be executed.

This behavior is fundamental to control flow in programming. If the condition is not met, the logical pathway dictated by the if statement does not activate, thereby leading to the outcome where the program can either execute other blocks of code (such as else or subsequent statements) or complete its execution without performing any actions related to the if statement.

This understanding solidifies the concept of conditional execution in programming, where decisions dictate which portion of code runs based on the boolean evaluation of conditions.