Difference between input masks and validation rule!!!
In Microsoft Aceess there are 2 aspects that you can design your database which is input masks and the validation rule. Both of these aspects are pretty much the same thing it is only allowing the user to type a specific thing only and noting else. The difference is is that input masks allow to write any thing in input masks for the particular reason. But with validation rule u have to use what is given, for example, for gender you have use m, f, or u, m= male, f= female or u = unknown.