This pie chart visualizes monthly expenses across five categories: Rent, Food, Travel, Shopping, and Bills. It uses the D3.js v7 library to compute arc paths with `d3.pie()` and `d3.arc()`, and renders each slice as an SVG path with labels positioned using `labelArc.centroid()`. A legend, built from the loaded CSV file, shows each category with its corresponding value and color from `d3.scaleOrdinal(d3.schemeCategory10)`.