Long-tail traffic refers to a type of website visitor that comes to your site looking for very specific information or products. Like a long tail on a monkey, these visitors don't get to your site very often, but when they do, they can be very valuable.
Let's pretend you're a toy store owner. You might sell a lot of the most popular toys, like dolls, cars, and action figures. These toys make up the "head" of your traffic, because a lot of people come to your site to buy them. But there are also some people who come to your site looking for very specific toys that might not be as popular, like a rare collector's item or a specific character from a TV show. These visitors make up the "tail" of your traffic, because they don't come to your site very often, but they have very specific needs.
Even though there aren't as many of them, long-tail visitors can be very valuable to your business because they're often more likely to make a purchase. If someone is searching for a very specific toy and they find it on your site, they're more likely to buy it than if they were just browsing for general toys.
So, in summary, long-tail traffic is when specific visitors come to your site looking for very specific things. They might not come to your site as often, but they can be very valuable because they're more likely to make a purchase.