How is similarity different from identity?

Similarity is characterized by the idea of resemblance between two or more objects or figures, without requiring them to be exactly the same in all aspects. When we say that two shapes are similar, for example, it means they share common properties, such as angles or overall structure, but they can differ in size, scale, or other specific measurements. Thus, the concept of similarity embraces the notion of likeness while acknowledging that some differences exist. This understanding highlights the core definition of similarity as a comparison that allows for variation, rather than enforcing an absolute sameness that identity would imply.