AutoHotkey is an excellent, free, open source programming/scripting language for Windows. It started out as a keyboard/mouse macros product, but has expanded into a robust language. This article provides an introduction to it, with links to additional resources for EE members who want to learn more.
Batch files are text files containing a script of commands that are executed by the command interpreter on DOS, OS/2 and Windows systems. Most commonly, they are used to perform a series of functions that are repeated -- copying a set of files created daily with one step, for example.