Tears are a clear, salty liquid produced by the lacrimal glands in the eyes. They serve several important functions, including keeping the eyes moist, providing lubrication, and helping to remove irritants. Tears can be triggered by various factors, such as emotions, physical irritation, or environmental conditions. There are three main types of tears: basal tears, which are constantly produced to maintain eye health; reflex tears, which occur in response to irritants like smoke or onions; and emotional tears, which are linked to feelings of sadness, joy, or stress. Each type plays a vital role in eye care and emotional expression.