What action is typically performed using Sass variables?

Sass variables are primarily used for defining recurring styles across components in a project. By utilizing variables, developers can create a consistent design system, making it easier to maintain and update styles. For instance, a color or font size can be defined once as a variable, and then referenced multiple times throughout the stylesheet. This approach not only reduces redundancy but also enhances the readability and manageability of the code, since changes to the variable value automatically propagate throughout all instances where the variable is used.

Storing user data, creating database connections, and managing API interactions focus on backend functionalities and do not relate to the styling aspects that Sass variables address. While those options are crucial for web application development, they operate outside the realm of CSS preprocessing and the specific advantages offered by Sass variables.