When someone lands on your website, the first question is: where did they come from? Google search? A Facebook link? An email campaign? That origin is called the traffic source, and understanding it is key to knowing which marketing channels are actually working for you.
There are four main types: Organic (from search engines), Direct (typing your URL), Referral (from other websites), and Paid (from ads). Tools like Google Analytics break this down clearly. Knowing your traffic sources lets you double down on what works and stop wasting money on what doesn't. If 70% of your traffic comes from Google, your SEO is strong — invest more there.