Difference between getline and ignore

void getLineAndIgnore(){
    
    string a, d;
    int b;
    
    getline(cin,a);
    cin>>b;
    cin.ignore();
    getline(cin,d);
   
    // Your code here
    
   
    cout << a << endl;
    
    cout << b << endl;
        
    cout << d << endl;
}