local server / testing server ??

to complete what @L e n a said, depending on your workflow , you can also use a testing server that will not be local to your machine but deported on a third machine as well on the LAN (your local network) as the WAN (internet), so that the whole team can work on the same site in a decentralized way while protecting the production server.

Therefore you can have two testing servers, one installed on your own machine, as Lena recommends by installing for example XAMPP, and one on a third party machine accessible by the whole team.

Depending on this, here are some articles that can help you... but you may need to play a translator https://www.puce-et-media.com/installer-et-configurer-un-serveur-web-en-local/  and if server technologies don't speak to you https://www.puce-et-media.com/presentation-et-introduction-aux-technologies-serveur/

In this type of configuration you will have access to 4 servers and sometimes more. But anyway, DW will always access only 3 of them simultaneously...

• local, (not represented on the screen capture down below), which will contain your local files (not really modifiable on the current site)
• testing (defined by the appropriate radio button) which will host your tests in progress
• remote (defined by the appropriate radio button too) which will publish your work to the Internet users.

so DW allows you to direct your work in a flexible and contextual way.

(In the screen capture above, I have hidden the URL and Connexion informations)

Unless you work with server-side code like PHP, you don't need a Testing server. 

Local View = your Local site folder.

Remote server = your online website.

Just in case of :

• Local https://helpx.adobe.com/dreamweaver/how-to/make-website-pt1-site-setup.html#define_the_local_site_folder_for_the_bayside_beat_site
• Local https://helpx.adobe.com/dreamweaver/using/set-local-version-site.html
• Testing https://helpx.adobe.com/dreamweaver/using/set-testing-server.html
• Remote https://helpx.adobe.com/dreamweaver/using/connect-remote-server.html

The "local server" does not exist. It is the "local site". It is a folder located in a tree managed by Windows or MacOS, so it is not able to interpret files written in PHP for example.

The "testing server" is a folder managed by a tree managed for example by Apache, and thus able to interpret server languages.

That do mean that you need to install a stack allowing to use server technologies as Xampp, Wamp, Lamp or Mamp. One of the most used is Xampp from Apache friends https://www.apachefriends.org/fr/index.html