What Is A Workflow Field Update in Salesforce?

Hi

Adding some points:

Field update is one of the workflow actions available in Salesforce. Workflow is used to automate tasks, emails we regularly send and other record updates according to the organization requirement. Field update actions let you automatically update field values. These field updates are used in approval process and work flows.

How to Create Field Update:

Click on Setup --> Build --> Create --> Workflow & Approvals --> Field Updates

Click on the new field update, enter name in the name field, and if you don't enter a unique name, by default it takes the name whom you entered before.

Unique name is used by API and managed packages. The unique name field can contain only underscores and alphanumeric characters. The name cannot end with underscores and shouldn't consist of two consecutive underscores. Enter the description. Select object to which you want to update field. Next, fields are shown for the object which you want to update. Select one of the fields.

Select Re-evaluate workflow rules after field change option, if you want workflow rules on this object to be re-evaluated after the field value is updated. Therefore, upon selecting this option, Salesforce re-evaluates all workflow rules on the object if the field update results in a change to the value of the updated field.

In the specify new field value, options are available based on the field you choose to update. Some of them are:

Choose a specific value, which consists of space to enter the value.
Choose a blank value(null) if you want salesforce to remove any existing value and leave blank.
Choose use a formula to set the new value to calculate the value based on an expression, merge fields or other values.

thanks