One special feature of wireless networks is their capacity to keep people in contact even when they switch locations. The adaptability and agility needed for wireless communications are provided. The fields of business, education, defense, home-based and industrial applications, and the military environment have all found use for wireless and mobile communications. The world has changed significantly as a result of wireless networks since they have made it easier, more reliable, and more efficient to send information abroad or behind enemy lines. An essential productivity tool for today's mobile workforce is wireless networking. With wireless networking, we may practically access corporate and other information resources at any time and from any location. In recent times, wireless networks have become more commonplace in several fields, such as satellite broadcasting, mobile analog, and digital cellular telephones. Supporting a good quality of service (QoS) in this environment for the delivery of voice, video, and data has therefore become one of the major challenges of the twenty-first century. In this research article, we provide an overview of wireless networks, their classification, and quality of service (QOS) parameters such as bandwidth, delay, delay variation (jitter), throughput, and energy. Lastly, we provide security information regarding various parameters for end-to-end communication over wireless networks.