What are the CI4 ways to use Database and Library in a Helper?

Again I am little bit confused about Service. I have read through the docs but still not clear about understanding "What is service?".

In CIv4 a Service is a type of factory to create new instances of the desired class. In other words, think of it as a kind of "helper" to load and instantiate a class. If you haven't already, read the v4 Documentation - Services info here

Think of it as a kind of "helper" to load and instantiate a class - this is very much easy to understand. Do not know why, CI4 doc is a little bit harder to understand than CI2 and CI3. But people like you, always make this easy.

Thank you again.

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