This interactive D3.js scatterplot visualizes the relationship between daily steps and calories burned from a personal wellness tracker. Each circle encodes water intake through its radius and the month of the year through its color. Users can hover over any point to see a tooltip with detailed values. The chart is built using a reusable `scatterPlot()` function that leverages D3's scale API (`d3.scaleLinear`, `d3.scaleSqrt`, `d3.scaleOrdinal`) and the `join` operator to efficiently create and update SVG circles. Data is loaded from an external CSV file.