The answer to 'what is flea' is a small, wingless insect that feeds on the blood of mammals, including humans, dogs, and cats. Fleas are typically brown or black in color and have a hard, flattened body that allows them to easily move through hair and fur. They have powerful hind legs that enable them to jump long distances, making them difficult to catch and remove.
Fleas are known for causing significant irritation and discomfort through their bites, which can lead to itching, redness, and even skin infections in some cases. They can also transmit diseases, such as typhus and plague, to both humans and pets. Controlling and preventing flea infestations is an important aspect of maintaining a healthy and comfortable living environment.