Industry has two main meanings in economics and everyday English.merriam-webster+1
In the economic sense, industry is a branch of an economy made up of firms that produce closely related goods or services, such as the automobile industry, banking industry, or tourism industry.
It refers to the companies and activities involved in producing goods (often in factories) or providing a particular type of service, and is often classified into primary (e.g., agriculture, mining), secondary (manufacturing, construction), and tertiary or service industries (e.g., finance, transport, entertainment).
More broadly, dictionaries also use industry to mean manufacturing activity as a whole or a distinct group of businesses providing a particular product or service.britannica+3
There is also a behavioral meaning: industry can mean the quality of steady, habitual hard work or diligence, as when someone is praised for their industry in their job or studies.dictionary.cambridge+1