சேலன்ஞ்ச்....

*Challenge for all masterminds*

🎍 _i'am an 8 letter word_
🎍 _First 4 is a question_
🎍 _2,3,4 protects our head_
🎍 _6,7, 8 is a software_
🎍 _7,8 are same letters._

*Who am i....??*