Docker Desktop is a free, easy-to-install, downstream application for a Mac or Windows environment. The application lets you build and share containerized applications and microservices. Docker consists of Docker Engine, Docker Compose, Docker CLI client, Docker Content Trust,  Kubernetes, and Credential Helper.

virtual environment has a hypervisor layer, whereas Docker has a Docker engine layer

Docker engine is the layer on which Docker runs. It’s a lightweight runtime and tooling that manages containers, images, builds, and more