what Is coverage and what are the dIfferent types of coverage technIques?

  
Coverage is a measurement used in software testing to describe the degree
to which the source code is tested. There are three basic types of coverage
techniques are
Statement coverage: This coverage ensures that each line of
source code has been executed and tested.

 Decision coverage: This coverage ensures that every decision
(true/false) in the source code has been executed and tested.

 Path coverage: In this coverage we ensure that every possible
route through a given part of code is executed and tested.