The most common way a user can arrive at your website is by typing the URL into the address bar. This is known as direct traffic. Your visitor arrives directly without coming from anywhere else on the web. Other forms of direct traffic include clicking on a bookmark, or links from documents that don’t include tracking variables (such as PDFs or Word documents).
Direct traffic is defined as visits with no referring website. When a visitor follows a link from one website to another, the site of origin is considered the referrer. These sites can be search engines, social media, blogs, or other websites that have links to other websites. Direct traffic categorizes visits that do not come from a referring URL.
Understanding how people landed on your website is a key component of optimization. If you’ve ever looked at Google Analytics (and if you haven’t you should), you’ve probably seen the words “Direct,” “Referral,” and “Organic” in relation to your traffic. These are the sources where your users come from — or what Google calls channels. But what do these words really mean, and why do they matter?
Hi SEO 4 Attorneys, it could be any thing is this for your site for a clients site.It could be an attempt at negative SEO from a competitor? The thing is people may try to push 100's of spammy links to a site in hopes to knock it down. In the end of the day my best advice is to monitor your link profile on a weekly basis. Try to remove negative links where possible if you cant remove them then opt for the disavow tool as a last resort. 
This, of course, if you do care about your organic traffic and your overall inbound marketing strategy and you don’t want to make a mess out of them. The truth is that Google has so many rules and algorithms for scoring a website and that the SERP is so volatile that it’s nearly impossible to predict which site will have the best organic traffic and from what exact reasons.
You could get even more specific by narrowing it down to customer base. Is there a specific group of clients you tend to serve? Try including that in your long-tail key phrase. For example: “SEO agency for non-profits in Albuquerque NM.” That’s a key phrase you’re a lot more likely to rank for. Not to mention it will also attract way more targeted, organic traffic than a broad key phrase like “SEO agency.”
Beyond organic and direct traffic, you must understand the difference between all of your traffic sources and how traffic is classified. Most web analytics platforms, like Google Analytics, utilize an algorithm and flow chart based on the referring website or parameters set within the URL that determine the source of traffic. Here is a breakdown of all sources:
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