DEVOPS is a reasonably new term (for something I've been doing for 25 years

), where the idea is the person handles DEVelopment and OPerationS for a client/company.
Basically instead of having a dedicated team for each, people do both, write code, test, manage requirements, deploy infrastructure, monitor systems, make required changes to everything to keep it all up and running.
It's popular for smaller companies, or larger orgs where they want more cross pollination of skills and self-managed support teams for specific areas of the companies tech needs.