I think that advertisement tells us about new items that may be good for our lives.
.... I like if you kept it plural :)
I think advertisements inform us about new products and their usefulness that enhance our knowledge about different options we have.Advertising message about the utility of a product enables the people to widen their knowledge.
Advertisement on a certain product helps the people to know about its features and usefulness to their lives.It has contributed to the betterment of the standard of living ofin the society.
As an example, pharmaceutical companies use advertisements to present their new drugs.
... keep it plural
You've written a very good essay.
Also, you should post this type of essays under "Writing feedback" forum... :D
Waiting to see some more essays from you ;)