how to compare intial field value with new field value

Summary:

Is it possible in Validation Rules to Check if the value of a field like Salary Amount has changed.

Requirement is to check if salary amount has changed in the current transaction,so need to check if Initial Field Value is different from Current Field Value.

We want to compare Proposed Salary Amount to the Initial Salary Amount.All suggestions welcome.

Thanks,Balaji
Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

24C

Code Snippet (add any code snippets that support your topic, if applicable):