Counting and Totalling
It is important to understand the difference between totalling and counting.
Counting is used to find how many numbers or items there are in a list.
Counting can keep track of how many iterations your program has performed in a loop.
In the above example, the new value of the Counter variable is the old value, plus an additional 1.
Totalling is used to sum a list of numbers.
In the above example, the new value of the Total variable is itself, plus an additional value (contained in the variable called Number).