This document provides an overview of ports and related concepts. It discusses how ports serve as critical infrastructure for transporting freight and people internationally. Ports connect maritime transport with other modes of transport and enable trading, distribution, and logistics activities. The document then describes different types of ports based on their size, roles, functions, and classifications like network ports, transshipment ports, and feeder ports. It also covers topics like port planning, development, costs, investment, and operations from economic, engineering, and logistics perspectives.