I am an 8 letter word. First 4 is the question. 2, 3, 4 protects our head. 5, 6, 7 IT company name. 7 & 8 are the same letters. Who am I?

Correct Answer: That 8 letter word is Whatsapp (a messenger app) First four letters: WHAT a question Letters 2,3,4: HAT protects our head Letters 5,6,7: SAP an IT company Letters 7,8: PP same