Great question! Plants transport food by using a special tissue called phloem. Phloem is made up of living cells that are connected end to end to form a long tube-like structure. The phloem carries the food, which is in the form of a sugar called sucrose, from where it is made in the leaves of the plant to other parts of the plant where it is needed. This process is called translocation.
The movement of food in the phloem is driven by a pressure gradient, which means that the food moves from an area of high concentration to an area of low concentration. The source of the food, which is usually the leaves, has a higher concentration of sucrose than the parts of the plant where the food is needed. This creates a pressure gradient that causes the food to move through the phloem to the areas of lower concentration.