What is the least expensive form of post-secondary education?

The least expensive form of post-secondary education is generally considered to be community college. They offer significantly lower tuition rates than four-year universities, and many programs can be completed at a fraction of the cost. However, "least expensive" is relative and depends on individual circumstances (location, specific programs, living expenses, etc.). Some free or very low-cost options may exist through specific scholarships or grant programs, but community college is the most widely accessible and affordable option for most people.