Schools with rolling admissions offer important options and opportunities that static deadlines don't.
Rolling admissions schools will accept and examine applications as they are sent in, instead of waiting to judge all applications concurrently. Schools with rolling admissions can be great for late admissions, or for finding out early on whether or not you are accepted, so you can change your plan accordingly.
Here are some articles to fill you in on the basics of rolling admissions:
Here are some links to fill you in on the basics of rolling admissions!