The advantages of containerization in application deployment include enhanced scalability, consistency across environments, and efficient resource utilization. Containers package applications along with their dependencies, allowing them to run uniformly on any platform, which significantly reduces environmental inconsistencies during development and production. This portability makes deploying applications quicker and simpler. Container orchestration tools like Kubernetes also facilitate automated scaling and load balancing, further improving maintainability. Additionally, microservices architecture within containers promotes better isolation and accelerates the development lifecycle.