This interactive line chart visualizes time-series data for multiple categories, highlighting one series on hover while dimming others. Built with React and D3.js (v5), it renders an SVG with animated line paths and circles, using `d3.scaleTime`, `d3.scaleLinear`, and `d3.line` to map data. The configuration supports axis toggles, grid display, and color schemes from `d3.schemeCategory10`.