What is ' (apostrophe) in Lisp / Scheme?

Question

I am on day 1 hour 1 of teaching myself Scheme. Needless to say, I don\'t understand anything. So I\'m reading The Little Schemer and using this thing:

Answer 1

The form 'foo is simply a faster way to type the special form

(quote foo)

which is to say, "do not evaluate the name foo and replace it with its value; I really mean the name foo".

I think SISC is perfectly fine for exploring the exercises in TLS.