This action is used to assign a value to a local, page, flow, or application variable. It can also be used to create a local variable.

When using code to reference a variable, the scope must be specified, unless it's defined in the current scope. If the scope isn't specified, it means it's the current scope. For example, on a page, the page's variables would be referenced as $variables.myVar instead of $page.variables.myvar.