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

intentFilters advertise the capabilities of a component and delimit the intents that can handle. an IntentFilter that a given Activity, Service or BroadcastReceiver will respond to a combination of action, data mime type, scheme, path, etc.

The intent by comparing the intent to intent filters based on three aspects:

1:- The intent action
2:- The intent data (both URI and data type)
3:- The intent category

action :
Declares the intent action accepted, in the name attribute. The value must be the literal string value of an action, not the class constant.

data :
Declares the type of data accepted, using one or more attributes that specify various aspects of the data URI (scheme, host, port, path, etc.) and MIME type.

category :
Declares the intent category accepted, in the name attribute. The value must be the literal string value of an action, not the class constant.

For example, This activity handles "SEND" actions with text data.