A pull request compares changes from one branch into another branch. The compare branch contains the proposed changes, while the base branch is the branch those changes are intended to merge into. A pull request also includes a description where the author explains what changed, why the change is needed, and any related issue or testing information. Repository visibility settings are not part of an individual pull request. Visibility settings belong to the repository configuration and determine whether the repository is public, private, or internal, depending on the account type and plan. Since pull requests focus on proposing, reviewing, discussing, and merging branch changes, the compare branch, base branch, and description are pull request components, while repository visibility settings are not.