This document discusses three major trade routes between 500-1500 CE: the Silk Roads, Indian Ocean trade route, and Trans-Sahara trade route. It notes that trade along these routes moved goods like silk, spices, textiles, as well as ideas, cultures, diseases and technology between places. A key point of continuity is that trade along the routes often did not involve direct trade between countries, but instead used "relay" trade through intermediate places, and brought diversity between the cultures along the routes.