How do open jaw tickets work?

Related questions

1. Are stopovers free?
2. Are there still travel agents?
3. Is it cheaper to book last minute?
4. Does America allow stopovers?
5. How long do round trip tickets last?
6. Can I get cheap flights last minute?
7. Are flight tickets cheaper at the airport?
8. Why are some flights cheaper than others?
9. What is the longest layover allowed?
10. Does teletext still exist?

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