Is Steam DRM-free?

I'm curious, could you clarify whether Steam offers DRM-free games? As a gamer and a consumer, I'm always interested in understanding the terms and conditions surrounding digital purchases. I've heard conflicting opinions about Steam's approach to DRM, and I'd like to get a clear answer from someone knowledgeable in the field. Is it possible to purchase and play games on Steam without being subject to any form of digital rights management? Or does Steam utilize DRM to protect its content?