Please learn the teaching PowerPoint “ How to Write a Summary ” by yourself firstly, then write a summary on the basis of following materials: “Online advertising is the means of selling a product on the Internet.With the arrival of the Internet,the business world has become digitalized(数字化)and people prefer buying things online,which is easier and faster.Online advertising is also known as e-advertising.It offers a great variety of services,which can not be offered by any other way of advertising. One major benefit of online advertising is the immediate spread of information that is not limited by geography or time.Online advertising can be viewed day and night throughout the world. Besides,it reduces the cost and increases the profit of the company. Small businesses especially find online advertising cheap and effective.They can focus on their ideal customers and pay very little for the advertisements. In a word,online advertising is a cheap and effective way of advertising,whose success has so far fully proved its great potential(潜力). ”