Change SQL Compatibility level | sql server database migration

This video talks about
Change SQL Compatibility level
sql server database migration
sql backward compatibility issues

SELECT NAME, COMPATIBILITY_LEVEL FROM SYS.DATABASES;

ALTER DATABASE [Test_DataBase]
SET COMPATIBILITY_LEVEL =130
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SQL Version DB Engine Ver Default Compatibility Supports
SQL 2019 15 150 150, 140, 130, 120, 110, 100
SQL 2017 14 140 140, 130, 120, 110, 100
SQL 2016 13 130 130, 120, 110, 100
SQL 2014 12 120 120, 110, 100
SQL 2012 11 110 110, 100, 90
SQL 2008 R2 10.5 100 100, 90, 80
SQL 2008 10 100 100, 90, 80
SQL 2005 9 90 90, 80
SQL 2000 8 80 80
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[manavaralithoammammavantal]

Do we require downtime for production servers to change the compatability level?

[lakshmikanthreddy]

Can we do restore from higher versions like 2022 to 2014 any posibility