Where does the ending 'ster' come from?

The ending 'ster' originates from Old English and is used to denote a person associated with a particular role or occupation. It often implies a sense of agency or active involvement, as seen in Words like "master" or "hipster." In some cases, it can also indicate a feminine form, as in "spinster." The suffix has evolved over time but retains its connection to personhood and profession.