Salesforce DX is a set of tools that simplifies the development and deployment of Salesforce applications by enhancing the development lifecycle and promoting version control.

The first step in deploying applications with Salesforce DX is setting up your development environment and connecting it to a Salesforce org using the Salesforce CLI.

Continuous integration (CI) automates the process of integrating code changes from multiple developers into a shared repository, ensuring that the application remains error-free and consistent.

A change set is a deployment method that allows admins to deploy changes between Salesforce orgs through the UI, while Salesforce DX is a more advanced toolset focused on developer workflows, version control, and automation.

A scratch org is a temporary Salesforce environment that is used for development and testing, allowing developers to quickly create and dispose of environments as needed.

Version control helps manage changes to code over time, allows developers to collaborate more effectively, and ensures that changes are tracked, reversible, and deployable.

A deployment pipeline automates the process of moving code from development to staging and production environments, ensuring that code is tested and validated before deployment.

Metadata in Salesforce, such as custom objects, fields, and pages, can be managed and deployed using Salesforce CLI, change sets, or Salesforce DX.

In Salesforce deployment, administrators often oversee the deployment of configuration changes, set up necessary permissions, and test the functionality in production after deployment.