A widespread tool for traffic analysis is SimilarWeb, owned by the Israeli SimilarGroup: upon entering the domain you will receive the most diverse data straight away. The tool reminds us a bit of Google Analytics with regard to the scope and data formatting. The way these analysis results are displayed is extremely helpful: for example, they show the temporal development of traffic and the various traffic channels, like social media, direct traffic, or e-mail. There is even a breakdown of the most relevant social media channels: you gain a lot of information about the online strategy of your competitors.
When the world is crashing around you, trust the data. Dive into Google Analytics and try to pinpoint where things went south. Think back on marketing tactics you recently pushed live and find the correlation. This should lead you to an internal audit, where you may discover an internal tool is broken or an external force is impacting your site. - Kirk Deis, Treehouse 51
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.