To view and manage existing sandboxes or create new ones
Setup>> Sandboxes or Data Management | Sandboxes
Real-time sandbox environments (types of Sandboxes)
Create sandbox copies of your environments for development, testing, and training without compromising the data and applications in your production environment. Sandboxes are completely isolated from your salesforce.com production organization, so anything you do in your sandboxes will not affect your salesforce.com production application, and vice-versa.
Configuration-only sandboxes copy all your production organization’s reports, dashboards, price books, products, apps, and customizations, but exclude all your organization’s standard and custom object records, documents, and attachments. Creating a configuration-only sandbox can decrease the time it takes to create or refresh a sandbox from several hours to just a few minutes, but it can only include up to 500 MB of data.
Developer sandboxes are special configuration-only sandboxes intended for coding and testing by a single developer. They provide an environment in which changes under active development can be isolated until they are ready to be shared. Just like configuration-only sandboxes, developer sandboxes copy all application and configuration information to the sandbox. Developer Sandboxes are limited to 10 MB of test or sample data, which is enough for many development and testing tasks.
Full Copy sandbox
Full sandboxes copy your entire production organization and all its data, including standard and custom object records, documents, and attachments.