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Critical Strike:

Critical Strikes ignores 50% of your opponents defense and resistance and deal increased damage. The chance to cause a Critical Strike is increased by Support.
[Formula] Chance to Critical Strike = 4 + (Support Advantage / 7)
The minimum Critical Strike chance is 1%.
The maximum Critical Strike chance is 20%.

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Critical Strike Calculation
I want to first provide some details on how your chance to deal a Critical Strike is calculated. To approximate your odds, take the difference between your Support and the target enemy's Support. Divide that difference by 7 and add the number you get to the base chance of 4%.

Let's use these numbers as an example: Your Support - 64 Enemy Support - 20

The difference in Support here is 44 points. Now, divide 44 by 7 and you get 6 (after rounding). So your chance to inflict a critical strike now becomes 10% (4% base odds + 6% Support bonus).

Also be aware that while Support improves your chance to inflict a Critical Strike, it also reduces your Enemy's chance to inflict a Critical Strike on you! In the same example, your opponent's odds to inflict a Critical Strike are very low (the minimum chance of 1% actually). This chance is calculated by taking the base chance of 4% and subtracting your Support bonus (which in this case is 6%). Since 4% - 6% = -2%, the minimum chance of 1% is used.

Understand that a 10% chance to inflict a massively damaging blow is an enormous advantage. Consider this... if in your average battle, you live to see 5 turns, each with a 10% chance to inflict a Critical Strike, your projected odds of inflicting at least one Critical during the battle become about 41%.