Why European visa is called Schengen?

Related questions

1. Can I visit Belfast with UK visa?
2. Can I travel to Russia with a Schengen visa?
3. Can I visit Ireland with UK tourist visa?
4. Can I visit Dublin with UK visa?
5. Is Serbia a Schengen country?
6. Can I travel to Cyprus with Schengen visa?
7. Can I travel anywhere in Europe with Schengen visa?
8. Can I get a 5 year Schengen visa?
9. What is the difference between EU and Schengen?
10. Can I use Schengen visa to travel to Ireland?

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