A variable is a letter or symbol that stands for a value that can change or vary. For example, in the equation y=2x+3, x and y are variables that can have different values depending on the situation.
The answer to the question is sometimes. A variable does not always stand for a value, because sometimes it can represent an unknown quantity that we are trying to find. For example, in the equation x+5=10, x is a variable that stands for an unknown value that we need to solve for.
A variable also does not never stand for a value, because sometimes it can have a fixed or constant value in a specific context. For example, in the formula A=πr2, π is a variable that stands for the value of π, which is approximately 3.14. In this case, π does not change or vary, but it is still considered a variable because it is a letter that represents a value.