What is the purpose of the .mk file in android

I want to how a .mk file works and where I have to use it? I have some downloaded source code and it includes lots of .mk extension files and I am stuck not knowing how to开发者_Go百科 handle it.

Seems like you came across a project using native code - Android NDK.
Check the samples provided on the link for more detailed information about building and running such a project.