Lard is rendered pork fat. This type of fat has bee n unpopular for many years due to its cholesterol content. Recently it has been "rediscovered" and used by chefs for it's flavor. It is still the preferred fat for some Mexican recipes. Available in most grocery stores or you can render your own. The highest grade lard is called leaf lard.
Lard is a commonly available product in most grocery stores. It is also available at Target and Walmart at both their retail stores as well as online.