advertisment in our live

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This time I get a one word title, that is "advertisment"...1)What is the advertisment MEAN by? 2)What is it ADVANTAGEOUS AND DISADVANTAGE? For me, I only know advertisment can promote some thing attract us to look or buy the product or service.In other hand, some advertisment will give some wrong information and misadvise the consumer.So, who have other suggestion and idea please comment,thank you very much.I need yours answers very much, thank you.