A "hardtail" refers to a type of mountain bike that features a solid rear end without any rear suspension. This design provides a lightweight and efficient ride, making it ideal for climbing and riding on smooth trails. Hardtails typically have front suspension, which helps absorb shocks from rough terrain while maintaining stability and control. Many riders prefer hardtails for their simplicity and lower maintenance compared to full-suspension bikes. They are often more affordable and can be a great choice for beginners or those who primarily ride on less technical trails. Popular brands like Trek and Specialized offer a variety of hardtail models to suit different riding styles.