The COUNTIF function counts the number of cells within a range that meet a single criterion that you specify. For example, you can count all the cells that start with a certain letter, or you can count all the cells that contain a number that is larger or smaller than a number you specify. For example, suppose you have a worksheet that contains a list of tasks in column A, and the first name of the person assigned to each task in column B. You can use the COUNTIF function to count how many times a person’s name appears in column B and, in that way, determine how many tasks are assigned to that person.This Excel tutorial has been created to help you learn microsoft excel online. On http://www.myelesson.org you get excel help and online file download facitity. This video lesson covers the entire topic in simple and easy to understand step by step approach.