The safety bicycle is a type of bicycle that became popular in the late 19th century. It features two wheels of equal size, which provides better balance and stability compared to earlier designs like the penny-farthing. This design made cycling more accessible and safer for a wider range of people. The safety bicycle typically has a chain drive system, allowing for easier pedaling and improved efficiency. Its introduction marked a significant advancement in bicycle technology, leading to increased popularity and the eventual development of modern bicycles. The design is often credited to inventors like John Kemp Starley, who played a key role in its evolution.