"Sandbox is copy of your production organization that contains the same configuration information or metadata, such as custom objects and fields, process builders, flows, and so on."
A sandbox is similar to the dev, test, and stage environments in other technology stacks. They are mainly used for the development of Salesforce applications and testing of newly developed features. We do not want to make changes in the production environment directly without testing it thoroughly. So we need these different types of sandboxes; depending on what we can do with them, we can choose which one to use. Some sandboxes only have metadata from production, and some may have both metadata and data in them. Sandboxes also vary in size. Let's see ...
