Understand the concept of "Market Coupling": Market Coupling is a fundamental mechanism for integrating and coordinating electricity trading between different regions/countries in Europe, operating primarily through the Price Coupling of Regions (PCR) and Single Day-Ahead Coupling (SDAC) frameworks. The system employs the EUPHEMIA algorithm to optimize cross-border transmission capacity allocation through implicit auctions, eliminating the need for separate capacity auctions while maximizing social welfare across regions. Power exchanges collect bids and offers, share order books, calculate cross-border flows, and determine market clearing prices in a coordinated manner. This integration brings multiple benefits including increased market efficiency, better price convergence, optimal use of interconnectors, enhanced security of supply, increased market liquidity, and lower price volatility. The mechanism operates across various European regions, including Central Western Europe (CWE), the Nordic region, Iberian Peninsula, Central Eastern Europe, and Italy with its neighboring markets, effectively creating a more efficient, integrated European electricity market while respecting physical network constraints.