In forex, global variables are values stored within a trading platform, most commonly MetaTrader, that can be accessed across different charts, indicators, or expert advisors (EAs). Unlike local variables, which exist only within a specific program or session, global variables remain available for future use, even after the platform is closed and restarted. This makes them especially useful for strategies that require communication between different trading tools or timeframes.

For example, a trader might use a global variable to store the result of a signal generated on a higher timeframe chart, which can then be read by an EA operating on a lower timeframe. They can also be used to set conditions, such as marking whether a trade is currently active, or to store values like stop-loss levels, lot sizes, or risk limits.

Global variables in MetaTrader can be managed through the terminal or directly within code using specific functions. While they offer convenience and flexibility, traders should use them carefully, as incorrect handling may cause conflicting signals or execution errors. Overall, global variables act as a bridge that allows different parts of a trading system to “communicate,” making strategies more dynamic and coordinated.

Global variables in forex are the major forces that influence currency prices across the world. These include interest rates, inflation levels, GDP growth, and employment data, which show the health of an economy. Central bank policies also matter because rate hikes or cuts can quickly shift currency demand. Geopolitical events, trade tensions, and elections create uncertainty that often drives sharp market moves. Commodity prices, especially oil and gold, affect currencies tied to resource exports. Market sentiment and risk appetite play a role as well, shaping how traders react to news. Together, these variables guide long-term trends and short-term volatility, helping traders understand why currency pairs rise or fall and how global conditions shape the forex market.