This means, neither components are aware of each other's existence but can still work together to give the desired result for the end-user. And any other component that exists and has claimed that it can do such a job through intent-filters, is invoked by the Android platform to accomplish the job. One component that wants to invoke another has to only express its intent to do a job.
But more often than not, implicit intents are the way to go and that is what is explained here. Of course, Intents can be made to work exactly like API calls by using what are called explicit intents, which will be explained later. API calls are compile-time binding while intent-based calls are.API calls are synchronous while intent-based invocations are.The fundamental differences between API calls and invoking components via intents are: So, it is almost equivalent to parameters passed to API calls. An Intent is basically a message that is passed between components (such as Activities, Services, Broadcast Receivers, and Content Providers).
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