What is the purpose of the brake lever on a bike and how does it help control the speed and stop the bike effectively?

The purpose of the brake lever on a bike is to apply pressure to the brake pads, which then press against the wheel rims or discs to slow down or stop the bike. By squeezing the brake lever, the rider can control the amount of pressure applied to the brakes, allowing them to adjust their speed or come to a complete stop as needed. This helps the rider maintain control over the bike and stop safely.