OpenTimelineIO (OTIO) is an open-source interchange format and API designed for editorial timeline information in film, television, and animation post-production workflows. Developed initially by Pixar Animation Studios, OTIO is specifically engineered to facilitate the exchange of cuts, clip metadata, track layouts, and timeline structures between different content creation applications, such as non-linear editors (NLEs) and digital audio workstations (DAWs). Unlike traditional video container formats that store audio and visual data, an OTIO file functions purely as a lightweight metadata container. It stores structural timelines in a structured JSON text format, allowing pipeline technical directors and software developers to easily parse, manipulate, and convert editorial data using Python and C++ scripts without needing to render or process heavy media assets. This capability drastically reduces the friction typically experienced when moving sequences between editorial, visual effects, and sound design departments.