Please take a look at the terms and definitions we use across Cloud Migration Tool's documentation space.
What is a cloud connection?
The connection you create between your Jira Server or Data Center instance and a Jira Cloud site in Cloud Migration Tool is called a cloud connection.
What is a migration?
A migration in Cloud Migration Tool is the process of transferring projects and issues from Jira Server or Data Center instances to Jira Cloud sites.
What is a configuration element?
A configuration element is an object in Jira's configuration like a project, workflow, custom field, screen, etc.
What is Cloud Migration Tool?
The short name we use to refer to Configuration Manager Cloud Migration Tool. That's our app that allows you to migrate projects and issues from Jira Server or Data Center instances to Jira Cloud sites automatically and with the least manual effort.