What is Advertising? How is it useful?

We can say that advertising is a digital medium of communication which is targeted to attract customer through promotions, videos, advertisement. These all things can attract customers to you the product.
But advertisement are not free its a paid medium of communication which could reach millions of people digitally according tou your budget.

Example- Facebook Ads, instagram ads, youtube ads etc. These are platforms are very active users can use these platforms for ads and to reach out to wider range of customers.