I added a poll to this thread, so please vote!
Would you like to read a beginner article on GameCareerGuide.com that explains:
1. What is a game engine? How is the game engine different from the game itself?
2. Where do game engines come from?
3. What are some of the different game engines, and what makes them different?
4. Which game engines can I get my hands on for free (or for fairly cheap)?