What is roster method in mathematics?

The roster method in mathematics is a way to represent a set by explicitly listing all of its elements within curly braces. For example, the set of primary colors can be represented as ( { \text{red}, \text{blue}, \text{yellow} } ). This method is particularly useful for finite sets, as it provides a clear and straightforward visualization of all members of the set. However, it is not practical for infinite sets, where other methods like set-builder notation are typically used.