Thetoday's world is the competition era.
->The modern world is an era of competition: it sounds more familiar to me
many businesses and companies are investing on the advertising and focusing on customer's absorbing .
Firstly, I replace on by in because according to the Oxford dictionary, 'invest on sth' means you want to make sth better than their present state. In this case, I think you mean that companies take advantage of advertising to earn profit, thus 'in' is more suitable. Secondly, we usually use the phrase customer aweraness instead.
the mind of the customer.
advertising provides an ambiance in which people can be able to get familiar with a new product.
I'm sorry butI have no idea of the function of 'in' in this sentence.
It is obvious that nobody buys the thing whichthathe or she does not know.
You lack a subject here. In addition. 'that' is used in a dependant clause instead of which.
observing there is no name of it on advertisement;
I am so disconcerted to understand this clause.
that how to influence such amazingso amazingly.
because of paying attention to advertisement; people select their goods.
I think a common should be at the position of the semi colon.
These are all of my opinions of your essay. I hope we will have further discussions about these points.