What I was confused about in my other comment was the usage of "ce" as a subject pronoun, but I think I figured it out. "Ce" is used only before être, as in ce sont or ce sera, while "ça" is used with any other verb other than être. Is this correct?
My other question is, why is this not "Est-ce que ça existe?". Can that be used as well? Or is there some exception?
Merci pour ton aide généreuse.
"c'est" is the required contraction of ce + est = this is or that is or it is
In plural: ce sont = these are or those are or they are
In this case, "ce" is a demonstrative pronoun.
Other demonstrative pronouns:
- ceci = this thing
- cela = that thing
- ça = short version (in speech) of "cela" = that thing
In front of a noun, "ce" can also be an adjective:
- ce chien = masc sing, in front of a word starting with a consonant sound
- cet homme, cet arbre = masc sing, in front of a word starting with a vowel sound
- cette phrase, cette eau = fem sing, all types of nouns
- ces mots = all plurals