Populations are a way to segment your data into groups of People or Companies.
A common starting point is to create two populations: All Accounts and All Leads. You can get more specific, segmenting by region (example: NW Accounts), or by any other attribute that your have on your data (example: Monthly Subscribers, Active Accounts). Populations are used to compare your data to your partner’s data. Once you and your partners have created Populations from your connected data, you’re ready to share.