This document discusses comparison patterns and provides examples comparing the Italian cities of Modena and Ferrara. It explains that comparison can identify similarities, differences, or both between two things or ideas. An example first notes similarities between Modena and Ferrara, such as their location in northern Italy and long histories with old buildings. A second example then points out differences, such as Modena being larger and better known for Ferrari cars, while some buildings and local foods also differ between the two cities.