Three little words all mean “this/that thing”: ça, cela, ceci. They differ almost purely by register — and picking the right one instantly places you as a natural speaker or a walking textbook.
The quick version — the full lesson is below. More shorts →
Ça is the contraction of cela and owns conversation:
In writing and formal speech, cela replaces ça: « Cela pose un problème. » « Cela dit… » (that said…). In an email to your boss, cela; at the café, ça. Meaning: identical.
Ceci is rarer and points forward or at something present: « Écoutez bien ceci. » (listen to THIS, coming now). « Ceci explique cela. » (this explains that). In practice, French increasingly uses ça/cela for both.
Before être, they all give way to ce: c’est, ce sont — not « ça est ». But with other verbs, ça stays: ça devient difficile, ça me plaît.
Four errors I hear every single week — all easy to kill:
Look inside the words. Ceci ends in -ci, as in ici (here): the near thing, the present thing, the thing about to be said. Cela ends in -la — a là (there) that lost its accent: the further thing, the thing already said. It’s the exact duo you know from ce pull-ci (this jumper here) versus ce pull-là (that jumper there). One glance at the last syllable and the choice makes itself.
— Bonjour ! Je peux goûter ça ?
— Bien sûr. Ça, c’est un comté de dix-huit mois.
— Mmm… ça a du goût ! J’en prends deux cents grammes.
— Très bien. Tenez, goûtez aussi ceci, c’est le petit nouveau de la région.
— Allez, va pour les deux. Ça fait combien ?
— Neuf euros vingt, s’il vous plaît.
Count them: the customer points at what’s already there with ça, and the fromager introduces the new arrival with ceci — handed forward, not yet known. The whole lesson in thirty seconds of shopping.
Casual-to-neutral. You can say ça in any conversation; you just avoid it in formal WRITING, where cela takes over.
Always c’est — ce replaces ça before être. The full c’est system: c’est vs il est.
Those are demonstrative ADJECTIVES (this book = ce livre); ça/cela/ceci stand alone as pronouns. Compare: ce, cet, cette, ces.

How to write the French bad-news email: front-load the context, name the new date, apologise at the right register, and commit again. With a full annotated model.
Learn more →N+1, CDI, CSE, cadre: a working reference to the acronyms and institutions that run a French office, and what each one actually means for you.
Learn more →A flat Non can cost you more than the favour you refused. Here is the refusal ladder, the constraint move, and how to say no up, sideways and down at work.
Learn more →How tu and vous actually work in a French workplace: who proposes the switch, the exact phrases, the awkward asymmetric period, and why email stays at vous longest.
Learn more →B1 means you can cope in French; B2 means you can argue. Four honest self-tests, a paper-by-paper comparison, and how to choose the level you will actually pass.
Learn more →At DELF B2, ticking the right box on a vrai/faux question earns you nothing if the justification is wrong. Here is how the item is actually marked.
Learn more →Your first 30-minute lesson is free — no card, no commitment.