How does Intents work internally in Android SDK?

In the Android SDK, Intents are a fundamental building block for communication between different components of an application, as well as between different applications. Intents are used to request an action from another app component, such as starting an activity, delivering a broadcast, or starting a service. They can carry data and provide information about what should be done.

Internally, when an Intent is created, it encapsulates all the information needed to perform a specific operation. This includes the action to be performed, the data to act upon, and any additional information the target component might need. Android then uses the Intent to determine which component should handle the request. Each app has its own manifest file, where components are declared, and Android matches Intents to these declarations.

There are two types of Intents: explicit and implicit. Explicit intents specify the component to start by name, while implicit intents declare a general action to perform, allowing any component that can handle that action to respond.

Here's a simple example of how to use an Intent to start a new activity: