A new user with less than 10 reputation points normally is not allowed to post two or more hyperlinks or images. The suggested edits feature allows them to bypass this restriction by suggesting an edit anonymously, and then using their post author vote to approve the changes.
One. One link, ha ha ha. Two. Two links, ha ha ha. Three. Three links, ha ha ha. Four. Four links, ha ha ha.
Another example: Answering StackOverflow questions without providing code snippet