Evergreen content is content that stays relevant until the time it becomes outdated.
Every new generation comes with technology and products to make our lives easier and better than before by solving old problems in more unique ways.
But what if it can become outdated? You will have to replace that product because it won't be future-proof. That is why companies like Apple, Microsoft, etc., launch new products every year to stay relevant in the market, even though the previous one was not bad. It is just that they are better than before.
You can keep writing about your favorite topic, which will be relevant for a long time.
They don't go out of style or become irrelevant over time as some trending topics do. Instead, evergreen content will continue to be valuable to your readers for years, maybe even decades.
The benefit of creating evergreen content is that it can continue to attract new visitors on an ongoing basis. The more you write over time, the more opportunities you have to drive targeted traffic to your blog or website.