This document describes an IoT and GSM based smart car parking system developed by four students and supervised by Sayeed Islam. The system uses sensors to detect vehicles and send data on available parking slots to a mobile app and users via SMS. It aims to reduce traffic congestion by allowing users to check parking availability remotely and book slots. The system was implemented using sensors, Raspberry Pi for data processing, a mobile app, and a motor. It provides real-time parking information and booking while allowing user authentication. The students tested various functions like single/multiple bookings and unauthorized access. The proposed low-cost system helps reduce traffic and supports smart cities alongside being cost-effective and real-time.