Step 1: Understanding the Concept:
Indifference curves are a tool used in microeconomics to represent consumer preferences. They are the foundation of ordinal utility analysis.
Step 2: Detailed Explanation and Properties:
\begin{itemize}
\item Graphical Representation: It is a curve where each point represents a "bundle" of two goods.
\item Equal Satisfaction: Every point on a single indifference curve yields the same level of total utility. A consumer would be equally happy with any combination on that curve.
\item Key Properties:
\begin{enumerate}
\item Downward Sloping: To get more of one good, the consumer must give up some of the other good to maintain the same level of satisfaction.
\item Convex to the Origin: This reflects the principle of diminishing marginal rate of substitution (MRS). As a consumer has more of Good X, they are willing to give up less of Good Y to get an additional unit of X.
\item Higher Curves Represent Higher Utility: An indifference curve that is further to the right and above another represents a higher level of satisfaction.
\item They Never Intersect: Intersection would violate the assumption of transitivity and consistency in consumer preferences.
\end{enumerate}
\end{itemize}