What does it mean to watch something on demand?

Related questions

1. What is on demand service?
2. How do I get SBS On Demand?
3. How do I stream 7 plus to my TV?
4. How do I get subtitles on SBS on demand?
5. Will an HD box work on a regular TV?
6. Is ITV hub free?
7. Does it cost money to watch on demand?
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10. Can you download SBS On Demand to watch later?

Tags

1. #service
2. #programmes
3. #their
4. #choose
5. #known
6. #demand
7. #usually
8. #broadcasters
9. #available
10. #these
11. #after
12. #because
13. #watch
14. #transmitted
15. #making
16. #internet