A fruit bowl visualization demonstrates D3's general update pattern. Five apples render as green circles at fixed positions. After one second, `fruits.pop()` removes the last apple, causing an exit transition that removes its circle. After two seconds, the fourth fruit's type changes to lemon, updating the circle's fill to yellow and radius from 50 to 30 via `d3.scaleOrdinal` color and radius scales. The code uses `selectAll`, `.enter()`, `.merge()`, and `.exit().remove()` to manage data joins with SVG circles.