About projects, project groups, and tasks
A few definitions and images that might help you understand the difference between projects, project groups, and tasks.
To begin with, an asset is a unit of information that you are translating or working with, such as a text document:

A project group is a representation of an entire translation job, from one source locale to one or more target locales:

Project groups usually contain multiple projects—one for each target locale. A project represents the work associated with translating all the assets in the project group into one target locale. Each project consists of tasks running through a specific workflow.
A task corresponds to a single asset in a single project for a single target locale; a locale is a combination of a language and a country or region where it is used. For example, French as spoken in Canada, Spanish as spoken in Mexico, or Italian as spoken in Italy:
