This grant aims to provide specific support for the co-programmed European Virtual Worlds Partnership and the Web 4.0 initiative. It seeks to foster a thriving European ecosystem for trustworthy, human-centric virtual worlds and an open, interoperable Web 4.0. The grant targets organizations capable of coordinating and supporting a diverse network including academia, industry (with a focus on SMEs), public actors, end-users, developers, and researchers. This is a SECTOR-SPECIFIC grant focused on digital technologies. It is open to entities from EU Member States and Associated Countries. Key filtering criteria include a focus on Virtual Worlds and Web 4.0, demonstrated ability to lead coordination and support actions, alignment with European values, and willingness to engage diverse stakeholders. This is a one-time call within the broader Horizon Europe program (2021-2027), specifically part of Cluster 4 'Digital, Industry and Space' for 2025.