All right. So version control system. What is about if you're new in the development world, this words don't tell you a lot. But don't worry, we'll learn it right now. So, version control system is a management system that tracks all modifications that you've made on file or set of files. For example, you have a code project and you have different files where you can work or other developers can work.

So this system helps you and your teammates to work on the same files without any worries like somebody will delete your code or at some cause it not working on a service. These changes files will be stored in the system and You can just easily navigate through history of modifications and track changes. It can be useful not for the workers on the writers that are creating books together or for example, some scientific community also using it like to the tracking changes on papers and it's also easy to work together Like for example, you submit some science documents and some other people doing a peer review and they can not only make notes, they can also help you to update some details in your documents. Version Control also appear in branch system and branch system helps to Developers by separating their spaces of working this way to use like, one developer can work on one branch.

And then when work is done, mesh is fraught with main branch. Or for example, you can tell a few tasks. And as a morning you want to work on first task and to work in on it on one branch, then you're jumping into another task, and to create a separate branch, where you can store only changes related to this task. Or you can have a repository just for one developer is easiest way to explain it's like a Google docs for example, where people can work on the same document and you can click on history and see what was done. What was deleted or change it and it's pretty useful, especially for all these changes will be sold and to trace it and so she says the main useful tool when something goes broken, for example, so you can open history and check where all was working fine and so where something was broken so you can easily navigate into the changes.

Okay, so the site is done. And the next slide we'll learn about where to find suicides websites that still get called by