System Navigation and Basic Knowledge Question

What SPRO stands for?

SPRO stands for SAP Project Reference Object.

It is used to configure the setting as per your client requirement by using the standard setting present in the system.  This where you can do all the SAP configuration work.  It is also known as the Configuration Menu.

What is full form IMG and SPRO? How are they different from each other?

What is Meant By SAP R3

We know that SAP R/3 is software, it particular it is client-server software. This means that the groups/layers 
that make up a R/3 System are designed to run simultaneously across several separate computer systems.