# Custom fields

## About custom fields

You can use custom fields to create additional parameters that do not exist in the Tuum system according to your business requirements. For example, additional fields for account details or KYC information.

The following Tuum modules support custom fields:

* Loan
* Risk
* Person
* Card
* Account
* Payment
* Deposit
* Collateral

## Definitions

* **Entities** refer to the business entity for which you add the custom fields.\
  For example, **LOAN.APPLICATION**, **ACCOUNT.ACCOUNT\_APPLICATION**.
* **Field sets** are the sets for which you can define and group the custom fields.\
  For example, adding a field set for credit risk scoring data for loan applications.
* **Fields** are the custom fields for a particular field set.\
  For example, adding a field for internal credit ratings in the credit risk scoring field set for loan applications.
* **Activity** refers to the business activity for which the custom fields can be used.\
  For example, using custom fields to make manual decisions on a loan application.


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