What is an example of an injective function?

Could you please provide an example of an injective function and explain its characteristics? I'm trying to understand the concept better and having a concrete instance would greatly assist my comprehension. Is there a specific type of mathematical relationship or equation that could serve as an illustrative example? Additionally, how does an injective function differ from other types of functions in terms of its behavior and properties? Thank you for your assistance in clarifying this concept for me.