What does the message "SQL Server String or binary data would be truncated" mean?

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The "SQL Server string or binary data would be truncated" message indicates that a data insertion or update operation has tried to store more data than a database column can accommodate. This can happen when the length of the data being inserted or updated exceeds the maximum length allowed for the column. To resolve this issue, the column's data type or maximum length should be modified to accommodate the data being stored.