Hi Arivazhagan Natarajan,
The WorkflowContext parameter provides the means by which you can pass business-related data to the workflow. An entity that stores the business-related data has to be selected as the parameter type. When a workflow is triggered, the parameter is filled with the current object of the specified entity
For your reference
https://docs.mendix.com/refguide/workflow-parameters/#entity
This context object is a facilitator for you in the mendix development tools. If this wasnt there then there could have been lengthier steps to get to your concerned object. Isnt it?