Ex.

High Priority and Low Severity:

Company logo is not properly displayed on their website.

High Priority and High Severity:

Suppose you are doing online shopping and filled payment information, but after submitting the form, you get a message like "Order has been cancelled."

Low Priority and High Severity:

If we have a typical scenario in which the application get crashed, but that scenario exists rarely.

Low Priority and Low Severity:

There is a mistake like "You have registered success" instead of successfully, success is written.