How many different kinds of barley are there?

There are several different types of barley, commonly categorized into two main groups: hulled and hulless barley. Within these categories, barley can be further classified into two- or six-row varieties, with the six-row barley typically having a higher protein content and being more commonly used for animal feed, while two-row barley is often preferred for brewing. Overall, there are numerous cultivars and varieties, resulting in a diverse range of barley types used for various purposes, including food, brewing, and animal feed.