Why can you see someone clearly through a clear glass window but not through a frosted glass window?

You can see someone clearly through a clear glass window because it allows light to pass through without significant distortion, maintaining a clear image. In contrast, a frosted glass window scatters the light as it passes through, diffusing the image and making it difficult to see details clearly. The texture or frosting creates a myriad of tiny surfaces that reflect and refract light, blurring the view.