The CONCAT function is one of the text and data functions. Is used to combine the data from two or more cells into a single one. This function replaces the CONCATENATE function.
There are three arguments: text1 = A1 (John), text2 = " " (space), text3 = B1 (Adams). So the function will combine the first name, the space and the last name into one cell and return the result John Adams.
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