What is the purpose of a wrapper?

Could you please elaborate on the purpose of a wrapper? I'm curious to understand how it fits into the broader context of cryptocurrency and finance. Is it primarily used for enhancing security, simplifying complex functionalities, or perhaps for integrating different systems? Could you provide some examples of how wrappers are being utilized in the industry today? Additionally, are there any specific challenges or considerations that need to be taken into account when implementing a wrapper? I'm eager to gain a deeper understanding of this concept and its practical applications.