In the documentation, Direct traffic is defined as URL's that people either type in directly or reach via their browser bookmarks. ... A known example is Safari browser in iOs6 and above.
PPC is an internet tool used to direct traffic to websites and improve the visibility in less time. If you put all of your best keywords into your PPC campaign then you stand a better chance of being seen by a lot of people.
Direct traffic refers to the traffic that reaches to your website by directly typing the URL on the browser or through social bookmarks, they had previously done on their browser pages.
It can mean a lot of things – direct/none basically means
This can mean:
your visitor typed your website address directly into the browser
your visitor clicked a link to your website inside a PDF
your visitor clicked the link to your website in your email footer
your visitor clicked a link inside an email (unless it was from one of your analytics-integrated email marketing service provider campaigns)
your visitor clicked on a shortened URL (sometimes)
Direct traffic are traffic which comes directly to your site by putting your site URL in the browser and not by search engine search , social media , paid campaigns etc