Dynamic Link Library
Dynamic Link Library (DLL) is a Microsoft Windows concept for shared libraries that contain code and data used by multiple programs simultaneously. It allows modular software development by enabling applications to load and use functions from external files at runtime, rather than linking them statically at compile time. This reduces memory usage and disk space by sharing common resources across applications.
Developers should learn about DLLs when building Windows applications that require modularity, code reuse, or plugin architectures, as they enable efficient resource sharing and easier updates without recompiling the entire application. Use cases include creating extensible software (e.g., with plugins), developing system utilities, or building large-scale applications where separating functionality into modules improves maintainability and performance.