Services are the smallest set of units that are created when you deploy through a GitHub repository or apply for a DB.
If you configure and deploy the same source repository twice, AppPaaS manages each as a separate service, regardless of whether the source is the same or not.
A project is a grouping of one or more services.
For example, if you want to create a homepage, you can configure it as a single service using only static files, HTML, CSS, and so on, but if you want to manage the content of the homepage separately and make it change dynamically according to data, you can configure it using frontend, backend, DB, and so on, as shown in below.
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If you configure multiple services, you need to collect and manage each deployed service. Services that need to be managed together can be grouped into projects.