Quand utiliser un Bar Chart
You are comparing values across categories
Revenue by country, headcount by department, votes by party. One bar per category, one number per bar, no ambiguity.
You want a ranking
Sorted bars turn a table into an ordered picture. The reader sees first, last and the gaps between them without reading a single number.
The differences are small and still matter
Because bars share a baseline, a few percent difference is visible and trustworthy. Pies and donuts cannot do this.
Your category names are long
Horizontal bars give long labels a full line each, with no rotating or truncating. This alone makes bars better than columns for most real-world category names.