Category: Logical
Returns a value you specify if a formula evaluates to an error; otherwise, returns the result of the formula
IFERROR(value, value_if_error)
Category: Lookup and reference
Looks in the first column of an array and moves across the row to return the value of a cell
VLOOKUP (lookup_value, table_array, col_index_num, [range_lookup])
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The VLOOKUP() function may return error if an exact match is not found. To handle such a case we use IFERROR() formula that replaces error message with a custom message you want to display.