Board Thread:Fun and games/@comment-25377450-20180627180057/@comment-35198094-20180628165422

I solve the puzzles.

Now, you must work out the riddle:

'''The person who makes me does not need me. The person who buys me does not need me. When you are using me you do not realise you are using me, and when you do not realise you are using me you are always using me. What am I?'''

NOTE: You MUST specify the correct answer!