if /then statement

An if/then statement consists of a Boolean expression followed by one or more statements.

if/then/ else statement

An if/then statement can be followed by an optional else statement, which executes when the Boolean expression is false.

if/then/elif/else statement

An if/then/elif/else statement allows you to have multiple else branches.

nested if statements

You can use one if or else if statement inside another if or else if statement(s).