Sensitivity and specificity are opposites. In the medical world, these two are needed in order to learn more about the various diseases that are available. Sensitivity means that there is a need to identify the people who are afflicted with the disease that is being tested. Specificity is known to be the ability of the test to identify the people who are not afflicted with the disease.
This is also known as the true negative rate. A high-specificity test means that this will be able to remove all of the people who do not have the disease, which means that there will not be available false-positive results that can make things confusing.