There are two areas of tech in any IT-based business that need to work together with a reasonable degree of harmony in order to be efficient. On the development side, you have the team that writes the code and creates the software your enterprise uses. On the other hand, you have the operational team that manages the tech systems which use that software.
In simple terms, DevOps is a way of working that allows the development and operations functions to work together in one symbiotic, virtuous circle – rather than operating as two distinct silos, sometimes at odds with each other. It can be seen as an approach or as an entire culture, but either way, DevOps is designed to improve efficiency in every part of the software development life cycle.