Kind (type theory) is a way of understanding how different types of information connect with each other, and how these connections help us make better predictions about how a system will work. Kinds can help us to better understand how a system works, so that we can better build and use it. Kinds represent different types of information, like numbers, letters, words, and shapes. The types of relationships between the kinds help us to make more accurate predictions about how a system will behave.