What does “pasture-raised eggs” mean?

It means that the eggs come from hens that live outdoors in the green during spring, summer and autumn and are regularly moved to new pasture. The hens spend time outside with plenty of space and pasture from sunrise to sunset, thereby consuming a lot of leaves, herbs, grass and insects. The eggs thus contain a lot of omega-3 and vitamin D, and the yolk is yellower than what you are used to seeing in regular eggs.