Which operator is used for strict inequality comparisons in programming?

The operator used for strict inequality comparisons in programming is the one that checks both the value and the data type of the operands. This means that it not only determines if the values are not equal to each other, but it also ensures that they are of the same type. This prevents issues that can arise from type coercion, where a value could be converted to another type during comparison, potentially leading to unexpected results.

In languages like JavaScript, for instance, using the strict inequality operator ensures that two values are truly different in both value and type. If one value is a string and the other is a number, the strict inequality operator will correctly identify them as not equal, whereas other comparison operators might not consider that discrepancy.

This distinctive feature of the strict inequality operator makes it essential for developers seeking to maintain type integrity in their code and avoid unintentional logical errors stemming from loose comparisons.