An injection is a function that maps distinct elements in one set to distinct elements in another set, ensuring that no two different inputs produce the same output. This property is crucial for understanding how sets relate to one another and plays a significant role in determining the cardinality of sets. Essentially, an injection allows us to establish a one-to-one relationship between elements, which is fundamental for comparing the sizes of different sets.
congrats on reading the definition of Injection. now let's actually learn it.