The Passeridae family includes around 43 species of birds, also known as Old World sparrows and snowfinches. They are native to Europe, Africa, and Asia. Some species have been introduced to other regions of the world. For example, the House Sparrow (Passer domesticus) has been introduced to North and South America, Australia, and New Zealand.

Birds in this family are found in open habitats such as grasslands, savannas, wetlands, scrublands and agricultural areas. Some species also live in woodlands and rocky areas. Many have adapted well to urban and suburban areas and often live close to people.

They are small, stocky birds, generally about 5–7 inches (12.7–17.8 cm) long. They have short, strong bills, short wings, short legs, and sturdy bodies. Most species are brown or gray, often with black or white markings. In many species, males and females have different coloring, with males often having brighter or more strongly patterned feathers.

Old World sparrows often feed in flocks. They eat mostly seeds and grains, but many species also eat insects, fruits, and berries.

New World sparrows and Old World sparrows are not closely related. New World sparrows belong to a different family, Passerellidae.