System variables are provided by the engine: e.g. UserInput, Payload, TimestampEpoch, TimestampHuman, ProfileName, ProfileMobile. Data Profile variables come from the contact’s data profile (Name, Phone, Email, FirstName, LastName, City, State, Country, ZipCode, Address, Gender, Currency, Language, DOB, CreatedAt, UpdatedAt). They are read-only and shown in Variable Management under their own tabs. Use them in message text, API params, and conditions for personalization.
