DevOps is a methodology or we can say its a set of practice to automate the software for the development team, DevOps is a combination of Dev + Ops means as per this development team and operation teams work together.
DevOps Case study of Netflix https://amido.com/blog/a-case-study-o...
Another Case study
https://blog.gsdcouncil.org/2-case-st...
For More please Watch the Below Video On DevOps