What is the meaning of It_is_what_it_is?

This thing has its own distinct nature; this thing is itself.

Synonym of that's life: A phrase expressing resignment to a situation or set of circumstances, usually without complaint; Thus meaning: this circumstance is simply a fact and must be accepted or dealt with as it exists.

Synonym of let it be: that is, because this concern is a constraint rather than a problem that can be solved (see "Lord grant us the wisdom to know the difference"), further analysis and discussion of it is unproductive, so let it be; accept the fact and let the matter rest.

  1. Synonym of who cares or synonym of I don't care

Synonym of who cares or synonym of I don't care

Source: wiktionary.org