Intel is used when contacting new regions, revealing hidden Dark Events, and purchasing items from the Black Market. Intel can be traded for Supplies from the Black Market, but not vice versa. Intel is typically more valuable than Supplies, and players should weigh their resources accordingly.
On the Network Tower Assault mission, Intel can be spent in order to gain squad bonuses for that particular mission.
Intel is gained through certain Hack Rewards (Guaranteed to have Intel reward option for Skullmining), completing certain missions types (Guaranteed to have Intel reward for Council missions), and Scanning at the player's home base with the respective scanning bonus active.