What is DevOps?

I've always thought dev ops was where one is both a dev and ops, but formally dev, and then also responsible for operations.

Apparently that was not the case, there is dev, and then there are devOps. Apparently the ops part is more important for devOps, and dev is actually geared towards the ops end and not actually developing features.

I was confused because I design and develop features, I build ops tools, I build and deploy CI/CD pipelines and I go oncall for bugs that happen. I thought I was devops, but apparently this is not how devops is defined in the broader industry. And apparently everyone else have much stricter role separation.