What defines a conflict in Git?

A conflict in Git occurs when two branches have changes to the same line in a file. This situation arises during a merge or rebase operation. Git cannot automatically reconcile which change should take precedence, leading to a conflict that requires the user's intervention to resolve. Users are notified of the conflict and must edit the affected files to determine which changes to keep, allowing them to make an informed decision about the final code.

The other scenarios presented do not constitute a conflict as defined in Git. For instance, adding new files in separate branches does not interfere with one another, meaning there is no overlap or contradiction that would lead to a conflict. Similarly, deleting a branch without warning or failing to push a commit do not create conflicts but rather result in issues related to branch management or version synchronization.