What is the main difference in between a UI KIT and a Styleguide?

We are working on documenting visual design and I wanted to know: what is the main difference between a UI KIT and a styleguide?

Is the difference between them that the styleguide includes design guidelines and best practices and the UI KIT is just showing the different components and their behaviors?

Or are both just 2 ways of documenting the same thing but with different names?