When you look through the glass in a window why can you see the glass and your reflection?

When you look through a window, you can see both the glass and your reflection due to the way light interacts with the glass surface. Some light passes through the glass, allowing you to see what's outside, while other light reflects off the surface, creating a mirror-like effect that shows your reflection. The visibility of both depends on the angle of the light and your position relative to the window. If the outside is brighter than the inside, your reflection will be more pronounced.