I don't have enough context to write an accurate overview. You've indicated this is a Wikimedia category, but haven't provided the actual category description or contents that would let me explain what "Films by decade" contains and why it matters in plain language. To write this accurately, I would need to see the category's description or examples of what films/subcategories it includes.
AI-generated from the Wikipedia summary — may contain errors.
via Wikidata · CC0
via Wikidata sitelinks · CC0
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).