It’s a company’s overall area of activity, service the company provides.
Examples:
- FedEx - courier delivery
- Starbucks - coffee
- Walmart - retail
A company can operate in multiple business domains (e.g. Amazon operates in both retail and cloud computing services).
Companies can change their business domains often (e.g. Nokia operated in wood processing, rubber manufacturing, telecommunications and mobile devices).
To achieve its business domain’s goals, a company has to operate in multiple subdomains