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Troubleshooting - It simply means to analyse and solve serious problems.
To trace and correct faults in a mechanical or electronic system.
Sometimes due to techincal snag or techincal glitch, things do not work properly in the way they are defined to work.
At that time troubleshooting acts as a helping agent by finding the glitch and resolving it by its own.

Identify the problem.
Establish a theory of probable cause.
Test the theory to determine cause.
Establish a plan of action to resolve the problem and implement the solution.
Verify full system functionality and if applicable implement preventative measures.
Document findings, actions, and outcomes.