There are A few ways which are the most common and the most popular but their effectiveness depends on the whole strategy.
First of all, TV commercial is the best way to reach AN audience and persuade them to purchase new products. Secondly, companies can use the Internet commercial or even they can set a web 'side' SITE for their products. It is getting more and more popular because in comparing (ale comparing CO?) to TV commercial there are very little costs.
Moreover, 'to' WITH specific products the best way of presenting 'it' (productS a pozniej IT? popraw) is direct mailing. In my opinion, there is noT one best and most effective way of advertising.
I think, that companies should find out customers needs and then prepare the apropriate commercial based on 'that needs' (cos tu nie tak - THOSE needs).