Asphalt shingles are now the most common type of roofing in North America. They are also popular in other regions of the world. Asphalt shingles were introduced in the 1890s and their quality improved significantly with the introduction of synthetic, or polymer, materials in 1945. There are several factors that make asphalt shingles an attractive choice for homeowners. First, they are relatively affordable, especially when compared to other types of roofing materials. Second, they are easy to install, often requiring only a few days to complete the job. Finally, they are relatively durable and can last for up to 20 years.