There are many uses of Dill, but some of the more obvious and popular would be for pickles and kraut. Growing dill in your garden can be beneficial for insects like butterflies as well. The Greeks and Romans used Dill, and many still do today.
I have grown the Long Island Mammoth type of dill, and that was an interesting experience, and I hope to do that again. It did well in a pot on my porch.
The image is from an Arabic herbal medicine guidebook, Tratado árabe sobre plantas medicinales.