श्रेणी:कालानुसार श्रेणियाँ

I don't have enough context to write an accurate 2-sentence overview. The context provided only indicates this is a "Wikimedia category" but doesn't explain what "Category:Categories by period" actually contains, how it's organized, or why it would matter to readers. Without additional information about its scope and purpose, I cannot create an accurate overview.

AI-generated from the Wikipedia summary — may contain errors.