This bar chart displays the frequency of letters from a CSV dataset, with a title text overlay. Bars are colored in teal, and clicking a bar toggles its selection, dimming non-selected bars and changing the selected bar’s fill. The visualization uses React with D3 v7, employing `scaleBand` and `scaleLinear` for scales, `axisBottom` and `axisLeft` for axes, and a `ResizeObserver` to adapt the chart to its container size.