Transport is a very broadly used term and generally means the movement of substances from one location to another. There are a number of processes that can cause the transport of substances, including advection, dispersion, etc. The transport of some substances, such as seeds can also be done by biological agents, such as birds. The transport of contaminants such as pathogens can take place through direct contact, food, water or air. The exhaust from our car engines gets transported through air. The transport of oxygen into our blood takes place through osmosis. The transport of materials in and out of cell is controlled by cell membrane and can be either active or passive.
As one can see, transport is a very broad term and its actual mechanism depends on the material under consideration.
Hope this helps.
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