Which reports can show you how website referrals, organic search, and ad campaigns assisted in the conversion process?
Multi-Channel Funnel reports
By default, the channel labels that you see in Multi-Channel Funnels reports (Paid Search, Organic Search, Social Network, etc.) are defined as part of the MCF Channel Grouping. If you have specific analysis requirements, you may wish to create your own Custom Channel Grouping(s), each with its own set of labels. When you share a Custom Channel Grouping, only the configuration information is shared. Your data remains private. The following channel labels are defined as part of the MCF Channel Grouping and are the labels used by default in your reports. The channel definitions are not case sensitive.
Read more here: https://support.google.com/analytics/answer/1250116?hl=en