This document describes Zook, an online car rental system that aims to act as an intermediary between car owners and renters. The system allows car owners to register their vehicles for rental online and renters to search for and rent cars online without having to visit an office location. Previously, car owners had to register vehicles at branch offices and renters had to register as clients at offices to rent cars. The new online system aims to reduce paperwork, time, and allow everything to be done remotely for more convenience and efficiency.