An established practise to increase the number of visits that a web site receives is called PPC – Pay-Per-Click advertising. It is called Pay-Per-Click because you only pay when a visitor clicks on your advertisement. The cost is usually a few cents per click.
The positive aspect of such advertising is the fact that you pay as you go and only if someone visits your web site. You do not pay for your ad to show up on the search engine and for people to see it without clicking. You are also in total control of the cost of advertising and cost per click.
The ads that can be used may be text, images or even small videos. You can choose to display your ads in any or all of the main search engines i.e. Google, Yahoo/Bing. You can also decide where your ad shows up and therefore increase or decrease the group of people that your ad becomes available to.