Can you explain regression testing and confirmation testing?

Confirmation testing : -If we fix a defect in an existing application we use 
confirmation testing to test if the defect is removed. It’s 
very much possible because of this defect or changes to the 
application it can affect other sections of the 
application. 

REGRESSION TESTING: Test the bug fixes r working properly 
as the specification and test, by fixing these bug any 
other feature may get impacted (conduct impact analysis) is 
regression testing.