Have you ever noticed how people and publications attribute where they get their information from in every day life? In real life, you're not going to include a formal citation in a blog post, a social media post, or an email to your cousin. However, you might link to a news article backing up a claim you make in that email.
We call these informal citations, or "blog style" citations.

Really, something as simple as a link to an article in an email is an informal citation.
Informal citations allow everyone to cite their sources in less formal forms of writing, like blog posts, emails, news articles, and webpages. Informal citations are how everyday creators of information acknowledge ownership, attribute quotes, check facts, and learn more. The beauty of informal citations is that they force you to think about how your sources fit, and actually say why you're sharing them. (Those are skills that you also need in order to write more formal research papers!!)