Visitor hit counter is a tool to display total number of web page visits in your website. It helps to make a website lively. Also, when you already have a large number of visits in your website, this tool increases trust for your website when you display it publicly.
Using this tool is also easy. Type the domain name and start count of your website and press the "Generate code" button. The tool will display HTML code which you could paste in the web page where you want to display the count.
This counter is different from iFrame based ones in that it does not affect the performance of your web page and SEO since it is not a complete web page itself but only an image element with a link.