The discontinuance of a component of an entity whose operations and cash flows can be clearly distinguished from the rest of the entity.
The purpose is to show someone reading the financial statements which pieces of net income will continue.
When both of the following happen, a company has a discontinued operation:
A component of an entity or group of components has been sold or disposed of, or is considered held for sale; and
if the disposal represents a strategic shift in the company and will have a major effect on the company’s financial results.
If a component of a business becomes a discontinued operation during a quarter, the company still has to report it as a discontinued operation.