In general use, herbs are plants with savory or aromatic properties that are used for flavoring food, in medicine, or as fragrances. Culinary use typically distinguishes herbs from spices. Herbs refer to the leafy green or flowering parts of a plant (either fresh or dried), while spices are usually dried and produced from other parts of the plant, including seeds, berries, bark, roots, and fruits. Herbs have a variety of uses including culinary, medicinal, and, in some cases, spiritual. General usage of the term "herb" differs between culinary herbs and medicinal herbs; in medicinal or spiritual use, any parts of the plant might be considered as "herbs", including leaves, roots, flowers, seeds, root bark, inner bark (and cambium), resin and pericarp. The word "herb" is pronounced "erb" without the "h" among North American speakers and those from other regions where h-dropping occurs. In botany, the word "herb" is also used as a synonym for "herbaceous plant".
Now some info for us non-book people: we just want to grow some to fresh herbs for cooking! Just companion plant some here and there in your garden. Herbs are also great for repelling insects!