what is the meaning of ?? in csharp

Code Example - what is the meaning of ?? in csharp

                
                        //the null-coalescing operator ?? returns the value of its left-hand operand if 
//it isn't null; otherwise, it evaluates the right-hand operand and returns 
//its result.
                    
                
 

meaning of ??= in csharp

                        
                                ??=
//assigns the right hand value to the left if left one is null
                            
                        
 

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