Macroeconomics: The study of "ordinary business of life" in aggregate. In other words, the behavior of the economy is analyzed as a whole.
Key Variables: Total Output (GDP), Aggregate Price Level, Employment and Unemployment, Interest Rates, Wage Rates, Foreign Exchange Rates.
Subject Matter: Factors that affect these variables; static level and changes over time.
Note: Macroeconomics focus on policy-oriented part of economics, especially how government policies affect economy (as a whole, of course).