When you enter data, you often find that you enter the same value in a field many times. For example, most of your customers might come from the United States, but you have a Country field for those customers outside the United States. Setting a default value for a field saves you the trouble of entering the expected data over and over while still allowing you to edit the value if needed.
Open a table in Design view.
Click the field to which you want to assign the default value.
Type the default value in ...