I don't have sufficient context to write an accurate overview. "Category:User es-4" appears to be a Wikimedia category related to Spanish language proficiency levels, but without additional information about what specific system it belongs to, what the "es-4" designation means, and its purpose on Wikimedia platforms, I cannot provide an accurate plain-language explanation.
AI-generated from the Wikipedia summary — may contain errors.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).