difference

Appeal: It is a legal proceeding by which a case is brought before a higher court for review of the decision of a lower court. Appeal is a process of re-examination by a higher court of the judgment, or the order or the decision made by a lower court in a suit or in a case. 

Revision: Revision is the act of examining again in order to remove  any defect or grant relief against irregular or improper exercise or non-exercise of jurisdiction by a lower court. Revision is like re-working and re-writing.