Start-ups and growth companies need help to find their path forward.  They need subject matter experts to advise them on certain problems faced by them in running their business or even before starting their businesses, like incorporation services, preparing initial business plan etc. As venture grow over the period the Challenger need on every step the help/advice of the Experts so that it can handle the situation in better way. The Partners and Mentors also look for the expert advice before entering into certain venture, they like to have better understanding of the venture. 

There are subject matter experts, having good understanding and experience in various aspects of the businesses and they are offering/interested to offer their services. These prospective or existing advisor can connect with the Challengers, the Partners or the Mentors and can offer their services.

Experienced CXOs and subject matter Experts from the industry can be advisors to those companies. 

The Challengers collaborates with advisors in hope that their skills and experience could be tapped on to answer the most pressing issues.