The different bugs are:

1. Show-stopper / critical bugs: The core dumps, products abnormally shuts down and no work around will be found out, like OS automatic freezing.

2. Major Bugs: The work around is found, but the implementation can be done, like performance degradency.

3. Medium Bugs: These bugs include database errors, link errors, low response time

4. Low/minor Bugs: These bugs are typos, simple GUI errors.