Here's what makes them stand out:
* Interruption: They break the flow of the main sentence to provide extra information, an aside, or a contrasting thought.
* Noticeable: They are usually set off with commas, parentheses, or dashes, visually marking them as distinct from the core sentence.
Example:
* "The new restaurant, which has a beautiful patio, is located on Main Street."
* "The dog, always a mischievous one, ran off with the newspaper."
* "This project – a real challenge – will require a lot of effort."
These phrases add detail and interest to your writing, making your ideas even more memorable.