Christmas is a hot season for many online stores. They gain the highest sales results on an annual basis, what is connected with intense preparation before this season.

Starting already in November the number of customers, who do the online shopping, is increasing. First we have Black Friday, then Cyber Monday and the hot shopping season lasts until Christmas. This trend is used by price comparison websites. We can notice here their advertising activity. Thanks to many different ad sources they attract Internet users.

Every online seller wants to know what to do to be chosen from many competitive stores.