For Syntax

A for loop has three distinct parts.

1. An initializer.

2. An expression which evaluates to a boolean.

3. A statement.

for (<INITIALIZER> ; <EXPRESSION> ; <STATEMENT>) {
    <CODE HERE>
}

The initializer is a statement which declares and initializes a variable like int number = 0.

The expression is some check like number < 5 that is checked each iteration to know if the loop should continue.

The statement is ran at the end of every iteration, generally updating the variable tracked by the initializer and expression.

These can be thought of as being the same as a while loop written like so.

<INITIALIZER>;
while (<EXPRESSION>) {
    <CODE HERE>

    <STATEMENT>;
}