Question:
what is landscape?
Answer:
Ok, what does the word landscape normally mean? The dictionary says that landscape mean an expanse of scenery that can be seen in a single view.
The same is true for SAP - an SAP instance is a concise view of all your SAP instances, components, and periphals. It can be charted using tools such as Visio and will show your DEV, QAS, and PRD instances, any additional servers such as web servers, perhaps your TMS route, etc.