An outbound change set is a change set created in the Salesforce org in which you are logged in and that you want to send to another org. You typically use an outbound change set for customizations created and tested in a sandbox and that are then sent to a production org.
|To create, edit, or upload outbound change sets:||“Create and Upload Change Sets”|
Watch a Demo: Release Management: Deploying Changes Using Change Sets
A change set can have up to 10,000 files with a total file size of 400 MB. Change set components are represented as metadata XML files. Make sure that your change set doesn’t exceed approximately 5,000 components.
Sending an outbound change set to another org doesn’t guarantee that the changes are implemented in that org. The change set must be deployed by the target org before the changes can take effect.
To help ensure a smooth deployment, review information about permission sets and profile settings in change sets.