What are the characteristics of a variable?

A variable is a symbol or element that can change or take on different values in a mathematical expression or statistical analysis. Key characteristics include its type (such as categorical or numerical), its scope (local or global), and its range (the set of possible values it can assume). Additionally, variables can be dependent or independent, depending on whether their value is affected by other variables in a study or equation. Overall, they are essential for representing data and relationships in various fields.