The translation of the phrase "it is what it is" in French is commonly given as:

• "C'est ce que c'est"
• Another frequently used expression that conveys a similar meaning is "C'est comme ça."
• In some contexts, you might also hear "C'est la vie," which roughly translates to "That's life" and carries a similar resigned acceptance.

Among these, "C'est ce que c'est" is a direct equivalent, while "C'est comme ça" and "C'est la vie" are idiomatic expressions capturing the same sentiment of acceptance or resignation to a situation.