A dylib file is a dynamically linked library used on macOS operating systems. It's analogous to DLL files on Windows and SO files on Linux. Dylibs contain code and data that can be used by multiple programs simultaneously, reducing redundancy and saving disk space. When a program needs a function or resource from a dylib, it dynamically links to the library at runtime, rather than including the code directly in the executable. This allows for easier updates and maintenance, as changes to the dylib can be applied to all programs that use it without requiring them to be recompiled. Dylibs are a crucial part of the macOS system, providing a modular and efficient way to manage code dependencies. They are essential for application development and system functionality, enabling code reuse and simplifying the process of updating and maintaining software. They are often used for shared frameworks and system libraries, contributing to the overall stability and performance of the operating system. Dylibs are typically created using compilers like clang or gcc, and they are managed by the dynamic linker, which is responsible for loading and linking the libraries at runtime.