Industry is the
production of
goods or
services within an
economy. The major source of revenue of a group or company is the indicator of its relevant industry. When a large group has multiple sources of revenue generation, it is considered to be working in different industries. Manufacturing industry became a key sector of production and labour in
European and
North American countries during the
Industrial Revolution, upsetting previous
mercantile and
feudal economies. This occurred through many successive rapid advances in technology, such as the production of
steel and
coal.