ISTEXT Function checks whether a value is a text. The result returns TRUE when it is text, and returns FALSE when it is not.
Formula:
=ISTEXT(value)
Explanations:
Value is required, the result returns TRUE when the value is text and returns False when it is not.
Example:
=ISTEXT(A1)
Cell A1 is a logical value, not text, so ISTEXT(A1) returns False.
=ISTEXT(A4)
Cell A4 is text "a", so ISTEXT(A4) returns True.