AirDrop is a means of sharing content with other nearby Apple devices; either yours or those of your friends. If someone shares something with you through AirDrop, you can accept or refuse the content being sent to you. Share content with AirDrop on your iPhone, iPad, or iPod touch
Also, you aren't receiving anything, in fact, the display show. Is "Recieving Off". You would have to change it to a different setting if you want to use Airdrop. I would suggest Contacts Only unless a specific transfer needs to occur.
Can u plz tell me at the time of deleting apps X sign appear we click X and apps gone but why video,music,voice recorder,note and other also show X I think there r by default apps there comes with device.