The three main classifications of occupation are industry, commerce, and services. Industry involves the production of goods through manufacturing, mining, or other processes. Commerce involves the exchange of goods or services, including buying and selling, transportation, and distribution. Services involve the provision of intangible goods, such as healthcare, education, or entertainment, as well as personal services, such as hairdressing, cleaning, or coaching. These three categories are not mutually exclusive, and many occupations may involve aspects of more than one category. For example, a business that produces and sells goods may also offer related services, such as repair or maintenance. Understanding the different categories of occupation can help individuals to identify potential job opportunities and choose a career path that aligns with their interests and skills.