NXT

WWE NXT pairs up eight wrestlers from WWE's developmental territory Florida Championship Wrestling (dubbed "Rookies") with wrestlers from WWE's existing Raw and SmackDown brands (dubbed "Pros"). This is a way to train the new, fresh stars before stepping into the company main show.

Each episode will feature Rookies being mentored by the Pros as they develop their characters grimick(their acting skills attitude) and performance skills in front of a live audience. In addition to matches, weekly challenges are held starting several weeks into the competition to further test the Rookies' physical and mental skills.

In various weeks, polls are held and evaluate the success of each Rookie. Some of these polls lead to eliminations of Rookies and determine the winner of the competition.The poll rankings are entirely determined by Pro's votes and fan votes(starting from season 2)

Here are the voting criteria:
1)Win-loss record within the show
2)Strength of opponents
3)Work ethic
4)"It" (CAN PERFORM at WWE main show) factor

The Winner from each NXT season will get a WWE contract as well as a championship match at any pay-per-view against any champion of his choosing.

i do not own these videos, credit to wwe.com and youtube.com
information and references are from wikipedia.com