[6] Shiny creates a reactive context wherein the user specifies, through input variables, the circumstances under which computations are re-executed, or graphs (often visualizations) re-rendered; this occurs almost instantaneously.

The input variables are evaluated via a user interface which allows the simple creation of widgets such as text boxes, radio buttons, and drop-down lists.

One is designed to accommodate the user interface, the appearance of which is restricted by the default choices, though can be extended through various other R packages.

The other is designed to accommodate the server computations and plot generating code, for which all the built-in facilities of R are available.

[3] This is an example of a basic application in R where:[8] And the equivalent application written in python:[9] And shiny express for python:[10] Deploying Shiny (R) can be achieved through several popular methods: