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Characterization of RF and microwave networks based on scattering parameters formalism is one of the most basic themes that microwave engineers need to fully comprehend. This topic is included in most of the common textbooks on microwave circuits. However, alternative tutorial presentations that help in clearer understanding of the topic are always welcome. This tutorial is such an attempt and makes use of the "concept-maps and concept-modules" approach discussed in another paper in this TRANSACTIONS . Concept maps are visual representations of relationship among various concepts relevant to topic and contribute to better understanding of concepts. In addition to S-parameters, this tutorial includes A-, Z-, and Y-parameters and their relevance to microwave network representation and design.