Docs / String
Concat is an AMPscript function in the string category. Null arguments become empty strings.
Concat(str1, str2, ...)
%%=Concat(FirstName, " ", LastName)=%%
Ada Lovelace
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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Concat in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.