Any Order passed by the Magistrate or the Judge during pendency of the Calendar Case and that deserves no appeal or revision is called Interlocutory Order.

For an example, any Order passed by the Court over rejecting a Petition under Section 317 of Cr.P.C. or 256 Cr.P.C. has no place for revision or appeal for it being an Interlocutory Order. Unless the Accused or the Complainant proves such Order was miscarriage of justice or legal infirmity the same has no place in law for any revision.  

It is important to note that all Orders are not Interlocutory Orders and at the same time Interlocutory Order is not an Interim Order.