Here’s more on the meaning of the charges:
The second-degree unintentional murder charge alleges Chauvin caused Floyd's death "without intent" while committing or attempting to commit felony third-degree assault. In turn, third-degree assault is defined as the intentional infliction of substantial bodily harm.
The third-degree murder charge alleges Chauvin caused Floyd's death by "perpetrating an act eminently dangerous to others and evincing a depraved mind, without regard for human life."
The second-degree manslaughter charge alleges Chauvin caused Floyd's death by "culpable negligence whereby the person creates an unreasonable risk, and consciously takes chances of causing death or great bodily harm.