The web is built on links, and web users routinely use links to find the information they need. When a site links to your site, web users follow those links, resulting in web traffic, or referral traffic. When these backlinks, also called inbound links, come from high quality sites, they also tell Google your content is authoritative and trustworthy. This is important because inbound links from respected sites are an SEO ranking factor, so they can boost organic traffic, too.
The simplest explanation for a sudden and unexpected drop in website performance is often analytics tags failing to fire. Always check tracking first to make sure website visitors are being accounted for before making drastic changes. Reconciling tracking issues will help mitigate the long-term impact. Additionally, making friends with your IT department will help avoid issues before they arise. - Nina Hale, Nina Hale / Performance Digital
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.