What is Release?

A release is a final version of the software that is ready for deployment. It is the culmination of several iterations. Releases can be made before the start or end of iteration.

What is Release train?

The Agile Release Train or ART is a primary value delivery construct in the SAFe framework of Agile. Each release train is a long-term, self-organizing team of Agile that plans, commits and delivers output together.