Where can a developer create and edit data templates in Sitecore?

The ability to create and edit data templates in Sitecore primarily takes place in specific interfaces that are designed for content and item management. The Content Editor is a well-known tool within Sitecore which allows developers to define and manage items, including data templates. Through the Content Editor, a developer can navigate to the appropriate location in the content tree, where they can create a new template, add fields, and set up the structure required for that template.

Additionally, the Pages option refers to the Content Editor's interface that allows developers to manage the site content structure, which includes creating and editing templates as well. This option provides a comprehensive approach to managing data templates alongside page content, thus supporting a seamless content management experience.

The other options focus on different functionalities. The Database Manager and Item Manager are not typically used for direct template creation and editing, as they focus more on data management and item-level operations rather than template structure. The Sitecore Cloud Portal and Security Editor focus on the broader platform and security management, not directly related to template design. The Item Editor and Template Builder, while related to item management, may not encompass the full functional range that the Content Editor provides in the context of creating new templates.