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The angle of the tires relative to the car's centerline when viewed from above. Toe-in (tires pointing inward) adds stability, while toe-out (tires pointing outward) sharpens turn-in response.
Jazar's Vehicle Dynamics Theory and Application explains the trade-off: "If a car is set up with toe-out, the front wheels are aligned so that slight disturbances cause the wheel pair to assume rolling directions that approach a turn. Therefore, toe-out encourages the initiation of a turn, while toe-in discourages it. Toe-out makes the steering quicker. The toe setting becomes a trade-off between the straight-line stability afforded by toe-in and the quick steering response by toe-out." Bentley adds in Ultimate Speed Secrets: "Toe can be either toe-in or toe-out. Toe-in is when the front of the tires are closer together than the rear; toe-out is the opposite. Toe can always be adjusted at the front and can be adjusted at the rear on cars with independent rear suspension."