hello! "ca" is more common (familiar language) in conversations but "cela" is the same thing but says more with a courteous language.
It is used to indicated something (in english this or that)
Je ne sais pas si mon anglais est bien ^^ désoler
2014年9月18日
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Indeed, ça is a contraction of cela. Remember to use the ç because "ca" could exist but it's a mistake, You can just find Ca or ca when you can't have the ç on your keyboard...