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Following earlier EOSC Interoperability Framework guidelines, this document provides an update from the EOSC Association Task Force on the practical and legal state of semantic interoperability.Semantic interoperability is essential to ensure that the concepts used in data and their descriptions are consistently understood by all users, both humans and machines, across different systems, disciplines and research communities. It plays a central role in making the European Open Science Cloud (EOSC) Federation a reality by ensuring that digital objects, such as datasets, publications and software, carry the same intended meaning for everyone involved. This is based on the principle that 'what is sent is what is understood', meaning that the precise intent and context of digital objects are preserved and interpreted consistently by both humans and machines. Achieving this level of shared understanding requires implementing semantic interoperability at both the data and metadata levels. By harmonising and standardising semantic interoperability practices, the EOSC ecosystem aims to achieve tangible benefits: improved data reuse, more robust data and metadata integration across disciplines, and enhanced readiness of scientific data for Machine Learning (ML) and Artificial Intelligence (AI) applications. A consistent approach to semantic interoperability is a technical requirement and a key enabler of open and FAIR science. It fosters trust, transparency and collaboration within and beyond the EOSC community. This document aims to support the EOSC Association in strengthening and extending the EOSC Interoperability Framework (EOSC-IF) by integrating the progress made in the EOSC Federation, Task Forces, Projects, Candidate Nodes, and European Data Spaces. The follow-up deliverable (2nd deliverable) will provide practical recommendations for data and metadata providers as well as repository and infrastructure administrators, to enhance their semantic alignment efforts and contribute effectively to the broader EOSC landscape. The main objective of this document is to present an overview of the current status of Semantic Artefact(e.g., vocabularies, ontologies, metadata schemas) usage and the practical implementations of semantic interoperability within the EOSC ecosystem. Building upon the foundational work of the EOSC-IF and earlier recommendations from the EOSC-A Semantic Interoperability sub-group Task Force (see footnote 12), it also synthesizes knowledge and practices gathered through a targeted survey and from nodes. This survey documents the experiences, needs, and requirements of European scientists engaged in EOSC projects, national and thematic nodes, while identifying the Semantic Artefacts (SA) and associated Semantic Artefact Catalogues (SAC) used for their storage, publication, and reuse.