This interactive visualization demonstrates the Caesar cipher encryption technique by allowing users to input text and a shift value, then animating the transformation of the alphabet. The code uses D3.js v7 to render SVG letter boxes that smoothly transition colors and characters over a one-second animation, highlighting which letters shift and which remain unchanged. User input is processed through a custom `caesarCipher` function, while the `d3.select` and `transition` APIs drive the visual feedback.