In many cultures, if not all, sausages were invented as a way to preserve meat in the days before refrigeration. Families would slaughter a pig and make some of the meat into sausages dry them before the meat went bad.
Here in China (and many other countries) some families in the countryside still do. But city families also make sausages to see them through the winter.
A selection of home made sausages in my kitchen in China
Sausages Drying