This environment makes available the vulnerable web application Juice Shop, developed by OWASP. It is offered by Root Me and OpenClassrooms as part of the OpenClassrooms course Réalisez un test d’intrusion Web.
It allows you to carry out several tests explained during the course at your own pace, particularly on access control. You can also use it to practice identifying vulnerabilities within a realistic application, once the course is over for example.
If you are looking for a more guided environment at first, OpenClassrooms - DVWA is for you.