River rapids are sections of a river where the water flows quickly and turbulently over rocks and other obstacles. This fast-moving water creates waves and eddies, making it a challenging environment for boats and swimmers. Rapids are often classified into different categories based on their difficulty, ranging from easy to extremely difficult. The formation of river rapids is influenced by the river's gradient, the type of riverbed, and the volume of water flowing through it. Whitewater rafting and kayaking are popular activities in rapids, attracting adventure seekers who enjoy the thrill of navigating these dynamic waterways.