A "Potting Soil" or "Potting Mix" is the medium you should use when growing plants in any kind of a container, inside or outside the house. These products are called "soilless mixes" because they do not contain any soil or dirt from outside. Trying to grow plants in dirt in a container is an invitation to disaster. To fully understand these products, see the file for "Choosing Potting Mixes" on the left.
For information about choosing a container for growing plants see Choosing Containers
For information about how to be successful growing plants in containers see the file "Growing Plants In Containers"