An ezine is like a really cool newsletter that people can read online. It's a way for people who are interested in a particular topic, like food or sports, to read articles and get information about that topic.
Let's say you really love dogs. You might sign up for an ezine that's all about dogs. Every week or so, you'll get an email with a link to the newest issue of the ezine. When you click on the link, you'll be taken to a webpage where you can read lots of articles about dogs. Some might be about how to train your dog, others might be about different breeds of dogs or cool things dogs can do.
Ezines are usually free to sign up for, so they're a great way to learn new things about a subject you're interested in without having to pay anything. Plus, because they're online, you can read them on your computer, tablet, or even your phone, which makes them really convenient!