Learn in the textbookSNS and the Data-Utilization Society
DefinitionSMS is a service for sending and receiving short text messages addressed to a mobile phone number.
ExplanationA message can reach someone who has no email address, as long as you know their phone number. Because the number of characters is limited, it suits brief contact such as sending a verification code at login.
AnalogyLike a short note that reaches someone with only their phone number, even if you do not know where they live.
Memory hookThe first S in Short Message Service stands for Short. Brevity is right there in the name.