Yeast infection, also known as candidiasis, is a common fungal infection that affects the skin, genitals, and other parts of the body. It is caused by an overgrowth of yeast, which can occur due to a weakened immune system, hormonal changes, antibiotic use, or other factors. Symptoms may include itching, burning, and discharge, and the infection can be treated with antifungal medication. Preventative measures such as maintaining good hygiene and avoiding irritating or tight clothing can also help reduce the risk of developing a yeast infection.