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An ordered list is a sequence of items where order matters and each item is numbered or lettered to show its position.

Key points:

• Purpose: show steps, priorities, rankings, or any sequence.
• Formats: numbers (1., 2., 3.), letters (a., b., c.), Roman numerals (I., II., III.).
• Use when order matters; use unordered (bullets) when it doesn’t.
• Nesting: you can nest ordered lists inside ordered or unordered lists; each level can use a different numbering style.
• Accessibility: include clear, concise item text; use semantic markup (e.g.,
  in HTML)

If you want examples (Markdown, HTML, or nested lists) or rules for a specific format, say which one.