This is the 38th most frequent French word.
c
The French word "c'" is a contraction of "ce," meaning "it" or "this" in English.
Here, 'C'' is used as a third-person neutral subject pronoun combined with the verb 'être' to denote 'it is'.
C'est un beau jour.
It's a beautiful day.
In this instance, 'C'' forms 'C'était', representing 'it was', combining with 'était' to indicate past tense.
C'était difficile, mais je l'ai fait.
It was difficult, but I did it.
'C'' is used here to highlight a principle or fact generally applicable, equating to 'it is' in English for emphasis.