Mudari': present or future verb
فِعْل مُضَارِعfi'l mudari' - present or future verb
Fi'l mudari is the present or future verb whose irab is studied through raf, nasb, and jazm.
Simple explanation
فِعْل مُضَارِع (fi'l mudari') points to an action happening now or in the future.
This is the verb type whose i'rab is studied through raf', nasb, and jazm.