Reward points are given for frequent shoppers.  For each product you purchase, you earn a percentage of that purchase as reward points.  These points can be used towards purchasing additional products in the future. 

Generally products offer 20% of the sales price as reward points.  For example:
Purchase any product for $1.00 and you'll earn $0.20 reward points.

Your cart will show you how many reward points you have earned when you go to check out.  You will also be given the option of using those reward points for your purchase.

Think of it as a discount - it's just our way of saying thanks for being a customer.