However, the tool is often criticized for only being able to deliver data on a limited number of websites. This is due to how Quantcast works: website operators first need to set up a data collection feed on their website so that Quantcast can collect data and estimate traffic from then on. If a page doesn’t work, the tool cannot display matching results. Because of this, Quantcast only really offers data on large, well-known websites.
Google Adwords is the most popular method for traffic. Since they are the top search engine right now it make sense to advertise there if you can afford it. You bid on keywords to get your site at the top of the search when your keyword comes up. There is more involved but it's all laid out at Google. There are a lot of other sites that use this advertising strategy called pay per click or PPC.
Not all web traffic is welcomed. Some companies offer advertising schemes that, in return for increased web traffic (visitors), pay for screen space on the site. There is also "fake traffic", which is bot traffic generated by a third party. This type of traffic can damage a website's reputation, its visibility on Google, and overall domain authority.[citation needed]
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