immediate to by pass validation in VF page with standard Controller || By pass validation in trigger

VF Page:

immediate

Boolean

A Boolean value that specifies whether the action associated with this component should happen immediately, without processing any validation rules associated with the fields on the page. If set to true, the action happens immediately and validation rules are skipped. If not specified, this value defaults to false.

Trigger:

Here is one strategy to bypass this behavior:

1. Add a "Skip Validation" Checkbox field to the object
2. Set the "Skip Validation" field to TRUE in a before trigger.
3. Add logic to your validation rules so that they do not execute if "Skip Validation" is set to TRUE.