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Vue.js uses a reactive data binding system to handle updates to the user interface automatically. When the state of a Vue instance or component changes, Vue’s reactivity system ensures that the changes are reflected in the DOM. This is achieved through a combination of getters, setters, and dependency tracking. Vue’s reactivity system leverages ES5 getters and setters to observe changes to data properties and trigger updates to the DOM as needed.

AWS CodeDeploy is a deployment service that automates the process of deploying code changes to Amazon EC2 instances, AWS Lambda functions, and on-premises servers. It supports rolling deployments, blue-green deployments, and canary releases, allowing for controlled and reliable application updates. CodeDeploy integrates with other AWS services such as CodePipeline and CodeCommit, providing a seamless CI/CD experience. It includes features for monitoring deployments, handling rollback scenarios, and managing deployment configurations, helping ensure smooth and consistent application updates across your infrastructure.

The AUTO_INCREMENT attribute allows MySQL to automatically generate a unique integer for a column, typically used for primary keys. For example, defining a column as `user_id INT AUTO_INCREMENT PRIMARY KEY` ensures each new user record gets a unique ID without manual input.