Everything worth knowing, nothing that isn't.
How it works
You write a template with variables and supply per-recipient values; the platform resolves each message before sending. Preview the resolved result and its segment count first. See /answers/what-is-a-message-template and /tools/message-template-previewer.
Why it matters
Relevant, personalized messages are opened and acted on more than generic blasts, which is why segmentation and personalization sit at the heart of effective messaging. See /answers/sms-marketing-best-practices.
The pitfalls
An unresolved variable sends a literal placeholder; a data-mapping error can send the wrong person's details. Validate variables and test with real sample data before a large send. See /answers/what-is-a-sms-blast.