This Sunday I talked about the passion of William Carey to reach "unreached" people groups, specifically the people of India. He not only became the father of modern day missions, but he also helped give us global view of evangelism.
In the 1700's the unreached people groups were called "heathen," but in the 1970's it was Ralph Winter, at the Lusanne conference, that first defined the term "unreached people groups."
Here's a summary: Unreached people are not those who have heard; unreached people are those who cannot hear. The difference is access to the gospel message not receiving the gospel. Unreached people groups are unreached for a reason. They are hard to get to, governments set up barriers, the culture is resistant, etc.
If you are interested in learning more, the Joshua Project details the scope and breadth of the need in our world.
Here is a link to what College Park is doing to reach unreached people.