SMS
Definition:
SMS stands for Short Message Service and is the technology that supports text messaging. In other words, text messages are delivered using SMS.
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GMail
GMail is Google's free, web-based email. GMail is unique in that you do not need to install any software to use it. Rather, you just need an Internet connection and a web browser. Some features of GMail not found in other email software packages include the ability to tag email and the displaying of multiple back and forth emails with the same subject as a conversation. GMail also touts one of the largest storage capacities of any of the web-based email providers.