What kind of operator is the == in the expression i == 20?

In the expression i == 20, the operator '==' is used to compare two values for equality. This operator checks whether the value of the variable 'i' is equal to the value 20. If the values are the same, it returns true; otherwise, it returns false.

The equality operator is fundamental in programming for making decisions based on value comparisons, allowing for the control of the flow of execution in conditional statements such as if statements. Understanding how the equality operator works is essential in writing effective and functional code, as it directly relates to conditions and outcomes in programming logic.