Without any context, I would assume you are looking for either Workflows, Flow Designer, or maybe Execution Plans.
Execution plans are specific to Service Catalog.
Workflow is a flow engine that you can use, anywhere in ServiceNow, to manage and automate a process. If you own the ITOM Suite or ServiceNow Orchestration you can do even interact with and automate functions outside of ServiceNow. Like creating a user in AD or rebooting a Windows server to re-mediate an incident.
Flow Designer is a newer tool that allows people to build automated flows without having admin access in ServiceNow or any coding knowledge. It's mostly drag and drop and can be used to create tasks, update tasks, request approval, and send notifications. Not as powerful as Workflow but pretty awesome.
I am curious about what you mean my "runbook" automation. I have years of experience with Miramba and MS Orchestrator and that term is commonly used with those tools but not typically with ServiceNow. There is one place in ServiceNow that they use the term "Runbook" and that is with the Security Incident module but I'm not aware that it is for any automation. It's more of a step-by-step process of how to respond to a security threat.
