In this section

Structure of the International Space Station

Propulsion

Communication

Navigation

Power

Computer

Resupply

Escape

Research in the ISS

Resupply

Progress supply ships will be used to ferry new supplies (food, water, medicines, oxygen, nitrogen, fuel, equipment, clothing, personal items) to the ISS. Solid waste from the ISS will also be removed by the progress supply ships.
Also, the space shuttle can bring new supplies to the ISS.

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Graphic:

Photo Courtesy NASA