MMS Vs. SMS Text Messages

SMS
Short message service, or SMS, allows text-only messages to be sent to landline and mobile phones, as well as to email clients. These messages are usually limited to 160 characters including punctuation and spacing. SMS messaging requires subscription to a text messaging plan through your mobile provider to use the service without additional fees.
MMS
Multimedia message service, or MMS, allows picture or video messages to be sent from a mobile phone to another phone or email address. The ability to send and receive these types of messages is a part of text messaging service, so you only need a subscription to text through your mobile provider to use this feature.
Difference
SMS text messages cannot be sent with pictures attached, but MMS messages can be sent with both pictures and text included in the message. MMS messages have the same 160-character limit as text messaging.