This is a common interview question at an early stage of your career and an important one too. So, let’s understand why we need a virtual interface in our environment. Interface signals are static ( Physically available ) in nature where the Class-based environment is dynamic in nature So, A virtual interface is a pointer to an actual interface in SystemVerilog. It is most often used in classes to provide a connection point to allow classes to access the signals in the interface through the virtual interface pointer dynamically
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