The benefit of using containerization in application deployment is its ability to package applications and their dependencies into a single, lightweight container. This approach ensures consistency across different environments, allowing applications to run seamlessly on any system that supports containerization technology. Containerization enhances portability, scalability, and resource efficiency while simplifying updates and rollbacks. Additionally, it promotes microservices architecture by enabling independent deployments, facilitating DevOps practices, and enhancing collaborative workflows, ultimately leading to faster development cycles and reduced downtime.