A "hardtail" is a type of mountain bike that features a rigid rear end, meaning it does not have rear suspension. This design makes hardtails lighter and often more efficient for climbing and riding on smooth trails. They are typically more affordable than full-suspension bikes, making them a popular choice for beginners and casual riders. Hardtails excel in providing a direct connection to the terrain, allowing riders to feel the ground beneath them. They are well-suited for cross-country riding and can handle a variety of conditions, though they may be less comfortable on rough, technical trails compared to bikes with rear suspension.