What is a Tiger Team?
A tiger team is a group of highly-skilled professionals who either engage in attempts to physically penetrate a secured location, or work on using hacking strategies to penetrate a virtual environment.
It is a military term which has been adapted to the civilian world.
In the military, a tiger team is often a force seeking to physically infiltrate an area.
In civilian use, particularly in IT, a tiger team is usually composed of skilled hackers who will seek to penetrate a network or other tech environment for the purposes of improving security and closing security loopholes. 
What is the benefit of having Tiger Team?
These individuals have been around for a long time and their specific duties have already evolved in some ways.
For one, they must be able to determine multi-dimensional solutions to problems.
They must also be able to use both scientific and statistical methods of problem solving.
Decision making skills are just as important in this case.
And, as in any kind of group working together, there must be coordinated action with all the members.
What are the risks of having a Tiger Team?
Individuals in a Tiger Team have specific IT skills and while they represent a great asset, they are also a danger in terms of unauthorized access and the ability to do damage to an IT system.
Employers have to do extensive research and background checks to determine whether skilled tiger team members could use their skills to compromise the operation in the future. They should have water-tight contracts drawn to cover the companies assets even after the Tiger Team has completed working on the project. 
What is a Tiger Team not?
1. What is a Tiger Team? – Definition from Techopedia. (n.d.). Retrieved from https://www.techopedia.com/definition/16163/tiger-team
2. The Importance of Six Sigma Tools: Tiger Teams. (2013, November 25). Retrieved from http://www.sixsigmaonline.org/six-sigma-training-certification-information/the-importance-of-six-sigma-tools-tiger-teams/
3. Adams, S. (n.d.). Dilbert – Tiger Team [Digital image]. Retrieved from https://s-media-cache-ak0.pinimg.com/originals/da/d7/70/dad770753f624dd071deed557c204a44.jpg