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Let us first consider the representation given below.
![9 (1).png](https://resources.cdn.yaclass.in/45c6b7c3-29e0-447b-97b1-3dede7ee7298/91w300.png)
The image given above is a cipher circle. Here \(A \rightarrow D\), \(B \rightarrow E\), and so on.
When represented as a function, the cipher circle is both one-to-one and onto.
Bijection:
A function that in both one-to-one and onto is a bijection.
![1.png](https://resources.cdn.yaclass.in/83fab091-65e3-470e-b928-9168d5e49e9c/1w300.png)
Since the bijection function is one-to-one and onto, it is also called one-to-one correspondence.
Also, a bijective function is both surjective and injective.