The need for Airports to have security is to basically provide protection to passengers and flights and ground crew and to prevent mishaps like bomb explosion, fire and theft related issues.
 
   
 

                                            

Entry / Exit                             Airlines Office
Baggage Screening Area          Enquiry
Check in counter                     Parking Area
Runway                                 Waiting Rooms
Perimeter                              Departure Lounge
Cargo Complex                      Lounge