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This section provides an overview of the design and capabilities of the \code{gadfly} framework.   Section \ref{hierarchy} describes the \code{Simulation}, \code{Snapshot}, and \code{PartType DataFrame} objects at the core of \code{gadfly}.   Our memory-efficient approach to data access is outlined in Section \ref{fileIO}, \ref{sec:fileIO},  and our handling of unit conversions and coordinate transformations is discussed in Sections \ref{units} \ref{sec:units}  and \ref{coordinates}, \ref{sec:coords},  respectively. \subsection{Organizational Structure}  \label{sec:hierarchy}