Info
With Snippets you can include text snippets in your content. You can make reusable snippets (pieces of text/content) and include them into your content via a tag, like {snippet my-first-snippet}
If you edit the article (or module or wherever you put the tag), you will still see the tag. But on frontend view you will see the content of the snippet instead.
You can use this to insert much used content for instance. Then, if you change the content of the snippet, it changes everywhere you have used the tag.