The Intent class is appropriately named. It is a class that demonstrates the intent of an Activity from our app. It makes intent clear and it also facilitates it.
All our apps so far have had just one Activity, but many Android apps are comprised of more than one.
In perhaps its most common use, an Intent allows us to switch between Activities. But, of course, Activities are classes. So, what happens to the data when we switch between them? Intents handle this problem for us as well by allowing us to pass data between Activities.
Intents aren't just about wiring up the Activities of our app. They also make it possible to interact with other apps, too. For example, we could provide a link in our app for the user to send an email, make a phone call, interact with social media, or open a web page in a browser, and have the email, dialler, web browser, or relevant social media app do all the work.
There aren't enough pages to really dig deep into interacting with other apps, and...