Fill in the blank: The standardized vocabulary used by structured data to label content on web pages is maintained by __________.

Schema.org is a collaborative, community-driven project that creates, maintains, and promotes schemas for structured data on the internet. These schemas provide a standardized vocabulary that webmasters can use to mark up their content, making it easier for search engines to understand the information on a web page. Google Search Console is a tool for monitoring website performance in Google Search, not a vocabulary standard. The JSON-LD Foundation does not exist; JSON-LD is a data format often used with Schema.org. The W3C (World Wide Web Consortium) develops many web standards, but Schema.org specifically focuses on structured data vocabularies.