Organizations allow you to group your Salesforce orgs so you can work in isolation.
Overview
Let's say that you are a consultant and you are working with multiple clients. You can create an Organization per client so that when you are doing work for that client, only the Salesforce orgs associated with that client will show up.
Creating and Managing Organizations
If you don't yet have organizations, you can get to the organizations page by navigating to the home page (click the waffle icon in the navbar) and then click Manage Organizations.
If you already have an organization created, you will see the organization switcher above the Salesforce Org dropdown at the top of the page.
Creating an Organization
To create an Organization, click the + Create New Organization button at the top of the page and choose a name.
The organization page is also a great place to manage all of your Salesforce orgs!
Assigning Salesforce Orgs to an Organization
You can move orgs by dragging and dropping them on the desired organization or to the Salesforce Orgs Not Assigned to Organization card.
Choosing an Organization
To make an organization active, click the Make Active button on the organization card. Alternatively, you can use the organization switcher at the top of the page to quickly do so.
Deleting an Organization
You can delete an organization by clicking the dropdown menu and choosing Delete.
Any Salesforce orgs associated with a deleted organization will still exist without an organization.