What is extension delivery system?

Answer 1

In the United States, around the time of the Civil War President Lincoln authorized the transfer of federal land to newly formed States for the purpose of setting up colleges or universities that would serve the needs of the people of the State. These colleges are called Land Grant Universities, and they are often located in States with a large agriculture base. As part of the ongoing mission required of the Land Grant Universities, these institutions provide outreach, education and low-cost services to farmers and ranchers in their state. This outreach is called an Extension Service, which is likely what you are asking about.