Organizations
The highest logical grouping level. At a smaller company this could represent the entire Engineering dept. Ex.
Matt's Development Shop
At larger companies this could be individual Business Units or even a Team. Ex.
Mark Corp. Analytics API Team
Create a new Organization
Once logged in navigate to the Dashboard and click on the Organizations tab to the left.
This will give you a list of all Organizations you're current a part of, plus the opportunity to create a new Organization at the top right.
By clicking on the Organization name you can navigate to the details page to see your current usage limits, billing tier, manage and invite users, and more.