A statistical measure that estimates the maximum potential loss a portfolio could face over a specific time period at a given confidence level. For example, a daily 95% VaR of $1 million means there's only a 5% chance of losing more than $1 million in one day.
Coined in the 1990s by J.P. Morgan's RiskMetrics system, combining 'value' from Latin 'valere' and 'risk' from Arabic 'risq' meaning 'that which has been given to you by God.' The concept formalized what traders intuitively understood about potential losses.
VaR is like a financial weather forecast - it tells you there's a 95% chance your portfolio won't lose more than X dollars tomorrow, but just like weather, the remaining 5% can bring financial hurricanes! The 2008 crisis showed VaR's limitations when 'once-in-a-century' events happened multiple times in a single year.
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