A tiny wingless jumping insect is flat from side-to-side. Fleas have very powerful back legs that help them jump onto humans and animals.
Fleas are bloodsuckers; they are common in homes and affect pets and humans. Fleas like to be in warm, moist conditions. They generally enter your home via your pets; although, adult fleas respond to movement, vibrations and exhaled breath. By simply walking across a flea infested area (your lawn, a public park, etc.) you can set off the natural jumping action of adult fleas. They then can easily hitchhike into your home, once they cling to your skin, clothing or belongings.