In MLA style, you'll need to include the author's last name, publication date, page title, and website title - yeah, it's a mouthful, but stick with me here. For example, if you're citing a website with an author, it would look something like this: Lastname, Firstname. "Page Title." Website Title, Day Month Year of Publication, URL.
Now, if the website doesn't have an author, you can use the title of the page instead - just make sure to put it in quotes. And, if you're feeling extra fancy, you can even include the access date - that's when you actually looked at the website, not when you wished you had looked at it.
But, let's not forget about APA style - it's like the cool cousin of MLA. In APA, you'll need to include the author's last name, publication date, page title, and URL - see, it's not that different from MLA, but just different enough to keep things interesting. For example: Lastname, F. (Year, Month Day of Publication). Page title. Retrieved from URL.