Docker, a popular containerization platform, plays a significant role in streamlining the development and deployment of IoT applications by offering advantages such as scalability, simplified development, enhanced security, and easier collaboration. Its lightweight nature makes it ideal for resource-limited IoT environments, enabling consistent application performance across different infrastructures. Despite its benefits, developers must address challenges like scalability, network limitations, and security vulnerabilities, which can be mitigated through IoT management platforms and best practices in security. Docker's integration into modern DevOps workflows further enhances the efficiency and security of IoT applications, making it an essential tool for managing the complexities of IoT development and deployment.