Sandbox vs. Production in Salesforce | Types of Sandboxes in Salesforce 

What is a sandbox in Salesforce?
What is production in Salesforce?
What are the different types of Sandboxes in Salesforce?
Which type of Sandboxes should be used for what purpose?
KEY MOMENTS -
Different types of Salesforce Instances - 00:05
How Developer edition instance is different from Sandboxes and Production - 00:25
Production instances - 00:36
Sandbox instances - 01:19
Sandbox refresh - 02:09
Different types of Sandboxes - Developer, Developer Pro, Partial Copy, and Full Copy - 02:52
What is Metadata in Salesforce? - 04:03
Use of each type of sandboxes - 04:31