Recommendation ITU-T H.266.2 provides reference software for Rec. ITU-T H.266 | ISO/IEC 23090-3 "Versatile video coding" and corresponds to the 2nd edition of Rec. ITU-T H.266. The reference software includes both encoder and decoder functionality. Reference software is useful in aiding users of a video coding standard to establish and test conformance and interoperability, and to educate users and demonstrate the capabilities of the standard. For these purposes, the accompanying software is provided as an aid for the study and implementation of Rec. ITU-T H.266 "Versatile video coding". This draft new Recommendation was developed collaboratively with ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information, and corresponds with ISO/IEC 23090-16 as technically aligned twin text.