Runners are stems that grow along the ground. Roots and new plants grow along the stem. Examples of plants that produce runners are strawberries and many grasses. You can easily grow new plants from runners by digging up the new plants, cutting them off the runner and planting them.
Offsets or suckers are new plants that grow on the stem of the parent plant. The offsets may have their own roots in the soil or be joined to the stem above the soil. To grow plants from offsets, use a knife to cut off the offset close to the main stem. Then plant the offset into a container or straight into the soil. Examples of plants that produce offsets are pineapples, bananas, sisal and dates.