SMS stands for Short Message Service, which is a text messaging service on mobile phones. It is a way to send text-only messages of up to 160 characters between phones. SMS is used as the correct terminology for a text message or text messaging. It is a protocol designed for sending brief text-based messages between mobile phones or devices. SMS is an initialism abbreviation, which means it is pronounced using its individual letters. The use of SMS as a verb has fallen out of use in recent years, and has been replaced with the verb “to text” .

Regarding Snapchat, SMS is not a feature of the app itself. However, users can send text messages to each other within the app, which would be considered SMS messages.