Intelligence is a stat that is unlocked by having Source-File 5 (i.e. Destroying BitNode-5).
Intelligence is unique because it is permanent and persistent. It never gets reset back to 1. However, gaining Intelligence experience is extremely slow. It is a stat that gradually builds up as you continue to play the game.
Intelligence will boost your production for many actions in the game, including:
- Hacking
- Infiltration
- Crime success rate
- Bladeburner actions
- Reputation gain for Companies & Factions
- Augmentation Grafting speed