By nature, humans are social creatures and thrive in urban spaces that foster social connections. Cities are essential to sustainable development since they are the center of economic development. They interact extensively with surrounding and with the rest of the world. The sustainable city concept focuses on improving the conditions of	the urban areas in order to create healthy, pleasant, livable, inclusive, safe, and resilient cities where residents want to live and work. This chapter provides an introduction on sustainable cities.
                                
                                
                                    
                                    sustainability, sustainable cities, smart cities, green cities
                                
                                
                                
                                
                                    
                                        
                                        
                                        
                                        
                                            
                                                
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