This file is a "Dynamic Link Library." Unlike standalone programs, DLLs contain code and data that can be used by multiple programs simultaneously.
The file is a critical component of the Cygwin environment, a large collection of GNU and open-source tools which provide functionality similar to a Linux distribution on Windows. Specifically, this DLL is part of the OpenSSL library used by Cygwin applications to handle cryptographic functions, secure communications, and data encryption. cygcrypto11dll 2021
: It is primarily bundled with the OpenSSL package within Cygwin or MSYS2 environments. This file is a "Dynamic Link Library