Instant messaging or IM is a real-time, usually text-based system where messages are sent to other users on the system. This can be one-to-one or one-to-many. One-to-many systems are often called...
No. SMS is a cell phone application. Instant Messaging is primarily a computer function, but some IM programs have an SMS gateway that allows Instant Messaging from your cell phone.
No. SMS is a...