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Just as a basic question in Magento 2. In Magento U tutorials, it says:

In Magento 2 Modules only communicate through API

One module in not aware of the internals of another, so the implementation can change.

Modules can be disabled or deployed on separate servers.

I don't get what it means by "Magento 2 modules only communicate through API" ? If I want to load products, how we are using APIs without knowing?

I need a little bit explanation about interface vs. API interface vs. Web API. Is there any difference ? How?

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In this particular statement, API refers to service contracts. It is different than web APIs.

A service contract is a set of PHP interfaces that are defined for a module. A service contract includes data interfaces, which preserve data integrity, and service interfaces, which hide business logic details from service requestors such as controllers, web services, and other modules.

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You can find more information regarding service contracts in the official documentation: http://devdocs.magento.com/guides/v2.0/extension-dev-guide/service-contracts/service-contracts.html

On the other hand, here is the official doc for the Web API: http://devdocs.magento.com/guides/v2.0/get-started/bk-get-started-api.html

Finally regarding your question to load products, I reckon you should check that question that highlights the benefits of using service contracts: Magento 2: what are the benefits of using service contracts?

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