Congratulations on completing question 17 with 100%!

The answer you're looking for is: AND.

In many programming languages and logics, the AND operator (`&&`) is used to check if both conditions in a conditional statement are true. It returns `True` only if both conditions are met, and `False` otherwise.

For example:

* `a > 5 && b < 10` will return `True` only if `a` is greater than 5 and `b` is less than 10.
* `a == 5 && a != 5` will return `False`, since the two conditions are contradictory.

The AND operator is often used in conditional statements to ensure that both conditions must be true for the overall statement to be considered true.