Yep ! Perhaps this article will help explain it to you.
Difference Between Sheer and Opaque Curtains | Home Guides | SF ...
Sheer curtains: Is it really means as it seems ??
Sheer means you can see through them
Yep. They let light in, but give you some privacy. I wouldn't use them as the only window cover in a bedroom, but in a living room or dining room it is fine. Which is where I have mine. I have had them with other curtains in my bedroom.