what is severity and priority

  Severity :
severity means how much intense the error is ,how much a error is critical for  the product .If further testing is not possible for this error it means severity is high and if the error does not affect the testing process it means the severity is low.
 priority
priority means in which order we fix the error.we have to fix the error according to its criticality .If a error is very critical then it is to be fixed first and if a error is not so critical it is to be fixed later
 
lets take some example
1.high severity and high priority
  In this condition both the severity and priority are high .so it s very critical condition
 example :
when the URL of the application is not working properly so here we can not proceed the further testing process.so here severity and priority both are high.
 2. when login to the application is not possible
2. low severity and high priority
  example 
 password not encrypted - if password is visible to everyone its a very critical condition . This condition does not affect our testing process we can continue our testing with this error but the priority is high so  this error has to be fixed right now.

 2.forget password not working properly
                                   
 3. company logo is not visible 

3 high severity and low priority

  example : let save button is not working properly but we have another alternative option(ctrl A) .so that can we can proceed the testing process .SO here the severity is high and priority is low
 4.  Low severity and low priority
  example:
 Spelling mistake in the confirmation error message like “You have registered success” instead of successfully ,success is written.