Learning Tools Interoperability (LTI), a technical standard developed by the 1EdTech Consortium, seamlessly connects external learning tool - like apps, assessments, or content - with platforms such as learning management systems (LMS). Finalized and adopted globally across K-12, and higher education, LTI enhances teaching and learning environments by enabling secure, single sign-on access without separate logins. It supports robust data exchange about users, their roles, and institutional enrollment, fostering an efficient, interconnected edtech ecosystem worldwide. The standard continues to evolve, with 16 extension specifications refining its capabilities.