Answer:
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
I am a chair that can move. What am I?
I am a key that is playful. What am I?
I go around and in the house but never touches the house
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.