A stack of money is a bundle of banknotes or bills of a particular denomination that are bundled together to protect them from getting lost or damaged. The term "stack" is slang for $1,000 in the US, but it can also refer to larger sums of money. A stack is equal to a strap, which is a collection of 100 bills consisting of the same denomination. Therefore, a stack of $1, $2, $5, $10, $20, $50, and $100 bills would equal $100, $200, $500, $1,000, $2,000, and $10,000, respectively. The term "stack" is versatile and can represent any denomination of currency, whether its $1 bills, $100 bills, or even a combination of different denominations. The value of a stack of money can vary depending on the context and the specific currency being used.