It is kind of like dress rehearsal before your important job interviews. You will be "interviewed" by professionals who have done many interviews in different IT companies.
thanks for the reply, paxys. According to your link, the negative meaning is shown as the third use case, it seems the primary use of the "pro" is to mean "professional".
not a self-promotion, however, the founder of the website is a friend of mine. if you really want to ace your job interviews, you may want to take a mock interview at the meetapro. Or if you want to help candidates better prepared for their interviews, you can offer your mock interviews there too.