Blockmodeling is a way of looking at two different types of networks that are linked together. It is like looking at how two puzzles with different pieces fit together. The way it works is that it looks at how the nodes in both networks are linked together and then tries to figure out the best way to group them. It's often used to see if there are any patterns or relationships between the networks. For example, if you have two networks that show people's social connections, blockmodeling can help you find out if certain groups of people are linked together more strongly than others.