What is a service?
A service represents a given application or database, such as PHP, Ruby or MySQL. For example, if your plan includes 2 services, you can run an instance of Python and an instance of MySQL. If you wanted to use an additional runtime, such as PHP, you would need an additional service. Note that depending on your app’s architecture, you may want multiple instances of the same runtime, such as two instances of Python, each with their own URL. In this case, each Python runtime would count as a separate service.
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