This is a great time saving feature, it allows the user to enter a bit of code or text, highlight it then save it for future user.  This will save time because the user will not have to type out the code each time.
	All the user needs to do is highlight the text, go to File > Save Selected Text as Snippet then enter a name and save the file.   To insert the snippet the user will need to open the left panel and click the Snippets tab and either highlight the snippet and drag it into the page, or double click on it and the snippet will appear where the cursor is.