This interactive bar chart explores Olympic swimming data from 1912 to 2020, showing the top 10 countries by gold medals for a selected event. Users choose an event from a dropdown menu, and the chart updates to display medal counts per country, with hover tooltips revealing each country’s fastest male and female swimmer. The visualization uses D3’s `scaleBand`, `scaleLinear`, and axis components, while an ordinal color scale assigns each country a unique color. Data comes from a CSV file sourced from Kaggle.