A more thorough explanation:

An adjunct account is a type of account that accumulates additions to another account. For example, a company may have an adjunct account for employee benefits that adds to the main payroll account. This allows for easier tracking and management of specific expenses.

Another example of an adjunct account is an accumulated-adjustments account in tax law. This account is used by S corporations to account for taxable-income items passed through to shareholders, such as accumulated earnings that would have been distributed as a dividend to the shareholders if the corporation had remained a C corporation.

Overall, adjunct accounts are used to provide additional information and organization to a company's financial records.