Does any one know , how to delete the others in itunes. it takes lot of space
Those are the data of the installed apps. Don't listen if someone says that it's an iOS, because it is not. On your iPhone, go to general > usage. It will show you all the programs installed on your iPhone. If you click any of them you will see how much of "others" it has (documents and data)
There's no way to delete it if you want to still have those apps. You can reinstal those which has the most "others" but after some time of usage, it will raise again.