Camber
The vertical lean of the wheel relative to the chassis. Negative camber (top of the tire leaning inward) tends to increase lateral grip because the loaded tire stands more upright mid-corner — at the cost of longitudinal grip for braking and traction, and of tire life when taken to extremes. Front and rear needs differ: driven and wider rear tires typically run slightly less negative camber than the fronts. Tire temperature spread across the tread is the honest way to judge whether the current value works.
Effect by corner phase
More negative front camber tends to cost a little braking performance while the car is straight.
The main payoff: a properly cambered tire carries more lateral load at steady state.
Excess rear camber tends to cost traction as power goes down.
Symptom tendencies
These describe tendencies, not rules.
Mid-corner understeer — the front washes out only in long, loaded corners Mid-corner
If the outer front shoulder runs hotter than the inner, more negative front camber tends to help; verify with the temperature spread after a stint.
Verify on track before you commit to a change.