What is an Algorithm?

What is an Algorithm?
An Algorithm is any well defined computational procedure that takes some values or set of values as input and produces some values or set of values as output.
       An algorithm is the a sequence of computational steps that transforms the input into output.
 We can also view an algorithm as tool for solving well specified computational problem. The statement of the problem specifies in general terms the desire i/o relationship.

Write an algorithm to find the largest among three different numbers entered by user.

Step 1: Start
Step 2: Declare variables a,b and c.
Step 3: Read variables a,b and c.
Step 4: If a>b
           If a>c
              Display a is the largest number.
           Else
              Display c is the largest number.
        Else
           If b>c
              Display b is the largest number.
           Else
              Display c is the greatest number.  
Step 5: Stop