A bounce sole design is characterized by the rear sole edge (the trailing edge) being closer to the ground than the front sole edge (the leading edge) when the club is addressed behind the ball. That relationship of the front and back of the sole creates an angled surface on the bottom of the sole, which resists the clubhead digging deeper into sand or digging deeper into tall grass.
At the same time, if the bounce angle of the sole is too great, it will be a killer when trying to hit shots from hardpan or very thin turf - the trailing edge will contact the hard ground first and literally could cause the leading edge to "bounce" into the belly of the ball, thus creating a far greater chance of hitting the dreaded bladed shot.
For more info about how bounce affects play, see:
Do course conditions or the type of swing I have influence how much bounce I need in my wedges?
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