This heatmap displays the distribution of movie certificates across decades, using data from the IMDB Top 1000 dataset. It shows how many films of each certificate type (e.g., A, U, UA) were released per decade, with color intensity representing movie counts. The visualization uses d3.scaleBand for axes, d3.scaleLinear for the color scale, and d3.axisBottom/axisLeft for ticks. Interactive features include a hover tooltip and click-to-highlight functionality that emphasizes cells sharing the selected decade or certificate.