It is very important to realize that DevOps is not a product. You cannot buy DevOps and install it. Thanks to Donovan for clarification. Microsoft Visual Studio is powerful and Complete DevOps Solution.
I tried to sketch diagram and simple definitions of DevOps practices.
Continuous Integration: is basically code merging into Source Control e.g (could be on Prem/Off Prem Microsoft Tools/Services) to make sure upcoming changes with other changes.
Continuous Delivery: is to continuous propagation of code changes on (Test, Pre Production/Staging OR Production).
Continuous Deployment: is code deployment on Production as soon as its ready rather than waiting for other changes and releases.