Pulex irritans, commonly known as the human flea, is a small, wingless insect that primarily feeds on the blood of mammals, including humans. These fleas are typically brownish in color and can jump long distances, which helps them move between hosts. They are often found in areas where pets or livestock are present. Human fleas can cause discomfort through bites, leading to itching and irritation. They are also known to transmit diseases, although this is less common today. Effective control measures include maintaining cleanliness in living spaces and treating pets with appropriate flea control products.