What are Intent Filters exactly?

Question

I\'ve read lots of articles about intent filters and I really can\'t understand exactly what they do?

so please if anybody can explain to me with a clear example what is

Answer 1

Intent Filters is a way of telling OS that let me handle/provide these kind of Activities/Services

By adding given filter to Manifest tells OS that i can also handle Sms service and whenever you send sms it will show in a list or you can also explicitly use this as your sms service.

And to explicitly using this service call it like ...

 Intent intent = new Intent("com.example.code.SMS_INTENT", Uri.parse(uri));

 intent.putExtra("from", "code");

 startActivity(intent);