Why we used sandbox org in Salesforce?

Sandbox is a copy of the production organization. You can create multiple copies of the organization that can be developed like one copy for development, another for testing and training and this can be done without any compromise of data in the production organization. It allows you to perform custom development and track quality assurance. When Salesforce rolls out new updates, you can test them out before applying them to your production organization. That way, nothing will be permanently changed before you know exactly what it does.

Hi Pooja,

A  sandbox is a copy of your production database’s configuration only, not the records. So they include all your objects, fields, user accounts, workflow processes, page layouts, and so on, but no data at all. The idea is that you can use these to test new ideas against the current state of your database but you won’t need to use any of your real records. Developer sandboxes are just a configured environment that’s set up the same way as your real database so that you can play around with it.