A mosquito bite occurs when a female mosquito pierces the skin to feed on blood. This process involves the mosquito injecting saliva, which contains anticoagulants to prevent blood clotting. The bite can cause localized swelling, redness, and itching due to the body's immune response to the saliva. Mosquito bites are common in many regions, especially in warm and humid climates. They can transmit diseases such as malaria, dengue fever, and Zika virus, making prevention important. Using insect repellent and wearing protective clothing can help reduce the risk of bites and associated health issues.