Traffic is the lifeblood of a website. The more people that see you site/brand the more potential your brand/business/message will receive. Blow are the potential sources for online traffic to your site.
Organic Traffic – Traffic that comes to a website via the search engines from a relevant unpaid search (see Wikipedia for more)
Referral Traffic – Traffic that comes to a website from another website. Like getting to a website by clicking a link in Yelp.
Paid Traffic – Traffic that comes to a website from paid ads or placements. Like PPC or Pay Per Click
Direct Traffic – Traffic that consist of people who enter your website directly into their browser.