What is an electronic machine that sometime used as a tool to do work?

This is a tricky question! It's very broad. "Electronic machine" covers a HUGE range, from tiny microchips to massive supercomputers. "Tool to do work" is also quite broad, as almost anything can be used as a tool.

To help me narrow it down, can you give me some more information? For example:

* What kind of work are you thinking of? Is it physical work, like building something? Or mental work, like analyzing data?

* What is the size or complexity of the machine? Is it something you hold in your hand, or something that fills a room?

* What is the purpose of the machine? Is it designed to automate a specific task, or is it more general-purpose?

Once I have some more context, I can give you a more specific answer!