Unity Cloud Build is a cloud-based build service provided by Unity Technologies that allows developers to build, test, and deploy their Unity projects to multiple platforms. Here are the steps to use Unity Cloud Build :

* Set up your project on Unity Cloud Build : First, you need to create a Unity Cloud Build account, set up your project, and configure your project settings. You can choose which platforms to build for, set up build triggers, and configure your source control settings.

* Connect your project to Unity Cloud Build : Once your project is set up on Unity Cloud Build, you need to connect your project to the service. You can do this by linking your project to a source control repository, such as Git or Perforce.

* Build your project : After you have connected your project to Unity Cloud Build, you can build your project by creating a new build. You can choose which branch to build from, which platform to build for, and which build configuration to use. Unity Cloud Build will then build your project in the cloud.

* Test your project : Once your project has been built, you can test it by downloading the build and running it on your local machine or on a device. You can also set up automated tests to run on Unity Cloud Build.

* Deploy your project : After testing your project, you can deploy it to various platforms, such as the App Store or Google Play. You can also set up automatic deployments to release new builds to your users.