Portmanteau of developer + operations, where infrastructure and application life cycle are coded using engineering best practices in a way that is repeatable and debuggable. Someone in devops will know tools such as Chef, Puppet, Virtualization, Containerization, Load Balancers, Network and Application Firewalls, IAM. Basically all the stuff that supports running an application. Application and System level cross cutting concerns.

Dont pretend you couldn't give the same answer, imposter.