Traction is how long it takes a grounded character to stop moving after said moving force has ceased. Characters with low traction slide farther when walking, dashing, wavedashing, getting hit, etc.
High traction gives the player more exact control over their character, so high traction is normally more useful. However, low traction is required for a long wavedash and pivot.
Traction is lowered significantly on slippery surfaces such as ice; characters will slide much farther on these (besides Ice Climbers, who are unaffected).
Lowest to highest traction[]
TBA