This opening Servicenow tutorial picks out the most significant foundations of ServiceNow, starting from the bottom up. Understanding the fundamentals of the ServiceNow platform is important. It gives insight into the concepts that underpin how everything else works.
An instance is several things. It is a URL (something like https://.service-now.com/); it’s software running in the cloud; it’s your copy of the ServiceNow platform.
ServiceNow provides a platform and suite of applications as a service. They worry about the hardware, Internet connectivity, and operating system security and provide you with the URL. All you need to get going is a web browser.