In my recent exploration of camera lenses, I came across the term "USM" and decided to dig deeper to understand its significance. USM stands for "Ultrasonic Motor," which is a type of autofocus motor used in some camera lenses. This technology enables fast and quiet focus adjustments, making it perfect for shooting videos and capturing images without disturbing the subject. The benefits of USM lenses include smoother focusing, enhanced precision, and reduced noise. Overall, a USM lens can greatly improve your photography experience, especially in situations where discretion and speed are essential.