Hi,
Slowly Changing Dimensions are Dimensions having Time Dependent Characteristics.
The values of Time Dependent Characteristics change over a period of time. For eg. Consider a Dimension "Employee Details" with characteristics;
Employee, DOB, Employment Status,employee Group and Designation.
The Designation of the Employee can change over a period of time and is a Time Dependent Characteristic.
this makes Employee Details a Slowly Changing Dimension.
Thanks,
Phani.