A physical representation is used to describe how software is deployed in data centers. For example: if you created a web application, say you are deploying it to the Amazon AWS cloud. Then the physical representation will show how many servers are used, what is the role of their server, what software components are installed on it, etc. Therefore, you can say that this view is more important for your operating group (system engineers, as indicated on this Wiki page)
A look at development is a conversation between developers regarding what software design is. This mainly concerns the logical organization of your code - package, classes, etc.
I hope he clarifies.
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