Wikidata, a multilingual "Wikipedia for data," is a free collaborative knowledge base that aims to manage the factual information of Wikipedia. Initially conceived as a text-based resource, Wikipedia has evolved to include structured data such as numbers, dates, and relationships. Wikidata addresses the challenge of extracting and managing this data by allowing users to edit and extend it without creating an account. Key features of Wikidata include open editing, community control over data and schema, support for plurality and secondary data, multilingual data, easy access through web services, and continuous evolution. Since its launch in October 2012, Wikidata has grown significantly, becoming one of the most active Wikimedia projects. It has integrated language links from Wikipedia articles, allowing for a unified representation of information across all language editions. Wikidata uses a simple data model with property-value pairs and qualifiers to handle complex data structures. The data is exposed in various formats and licensed under a Creative Commons CC0 license, making it freely reusable. Wikidata's applications range from language labels and descriptions to identifier reuse, accessing and enriching applications, and advanced analytics. The future of Wikidata depends on the trust and engagement of the Wikimedia communities, which will shape its evolution and integration with other data sources.Wikidata, a multilingual "Wikipedia for data," is a free collaborative knowledge base that aims to manage the factual information of Wikipedia. Initially conceived as a text-based resource, Wikipedia has evolved to include structured data such as numbers, dates, and relationships. Wikidata addresses the challenge of extracting and managing this data by allowing users to edit and extend it without creating an account. Key features of Wikidata include open editing, community control over data and schema, support for plurality and secondary data, multilingual data, easy access through web services, and continuous evolution. Since its launch in October 2012, Wikidata has grown significantly, becoming one of the most active Wikimedia projects. It has integrated language links from Wikipedia articles, allowing for a unified representation of information across all language editions. Wikidata uses a simple data model with property-value pairs and qualifiers to handle complex data structures. The data is exposed in various formats and licensed under a Creative Commons CC0 license, making it freely reusable. Wikidata's applications range from language labels and descriptions to identifier reuse, accessing and enriching applications, and advanced analytics. The future of Wikidata depends on the trust and engagement of the Wikimedia communities, which will shape its evolution and integration with other data sources.