Vehicular Ad Hoc Networks (VANET) are self-organized wireless network for Intelligent Transportation Systems (ITS) that allow vehicles to collaborate with each other, to improve driving efficiency and enhance traffic safety without centralized infrastructure. Vehicles are equipped with sensors, global positioning systems (GPS) and communication systems to perform the tasks related to safety, efficiency, and comfort on the road. Data dissemination strategies in VANET help in improving safety, efficiency and comfort by reducing the delivery delay time and ensuring the reliability of message delivery. The available literature papers contain a number of proposed techniques for data dissemination in VANET. This paper presents a systematic literature review for existing data dissemination techniques in VANET in the viewpoint of the data related characteristics and applications such as safety and infotainment. The motivation behind this work is to provide the audience with the required understanding of the data dissemination in VANET, highlight potential opportunities and challenges, and also investigate the recent studies available in reputed resources directed towards the domain of data dissemination in VANET. Especially, this paper provides the audience with a comparative analysis of delay-tolerant and delay-sensitive data dissemination in VANET.

车辆自组织网络 (VANET) 是用于智能交通系统 (ITS) 的自组织无线网络，允许车辆相互协作，提高驾驶效率并增强交通安全，而无需集中式基础设施。车辆配备传感器、全球定位系统 (GPS) 和通信系统，以执行与道路安全、效率和舒适性相关的任务。VANET 中的数据传播策略有助于通过减少传递延迟时间和确保消息传递的可靠性来提高安全性、效率和舒适度。可用的文献论文包含许多提议的 VANET 数据传播技术。本文从数据相关特性和应用（如安全和信息娱乐）的角度对 VANET 中现有的数据传播技术进行了系统的文献综述。这项工作背后的动机是为观众提供对 VANET 中数据传播的必要理解，突出潜在的机遇和挑战，并调查针对 VANET 中数据传播领域的知名资源中的最新研究。特别是，本文为读者提供了VANET中延迟容忍和延迟敏感数据传播的对比分析。突出潜在的机遇和挑战，并调查针对 VANET 数据传播领域的知名资源中的最新研究。特别是，本文为读者提供了VANET中延迟容忍和延迟敏感数据传播的对比分析。突出潜在的机遇和挑战，并调查针对 VANET 数据传播领域的知名资源中的最新研究。特别是，本文为读者提供了VANET中延迟容忍和延迟敏感数据传播的对比分析。