Explain what creating and using a pull request in a version control system means.

A pull request is a mechanism in version control systems (such as GitHub, GitLab) that allows developers to propose changes to the code for integration into the main branch of the project.

The process looks like this:

1. A developer creates a separate branch and makes changes in it.
2. After completing the work, they create a pull request — a request to merge their branch with the main one.
3. Other project participants can review the changes, discuss them, and suggest modifications.
4. After approval, the changes are merged into the main branch.

This helps organize collaborative work, conduct code reviews, and control code quality before integration.