I'rab: grammar role shown through endings
إِعْرَابi'rab - grammatical state or analysis
I'rab helps learners see what an Arabic word is doing in a sentence.
Simple explanation
إِعْرَاب (i'rab) helps the learner see what a word is doing in a sentence.
The i'rab of an اِسْم (ism) is taught separately from the i'rab of a فِعْل مُضَارِع (fi'l mudari'), because they do not work in exactly the same way.