The same as it has been used for thousands of years: doing calculations.
An expert abacus operator can visualise numbers and do calculations (usually) faster than someone with an electronic calculator - using an abacus visualised in their head, a skilled operator can often do calculations faster than with a physical abacus.
Abaci have the advantage that the batteries don't wear out (as there aren't any), which makes their use in places with limited supply of power preferable.
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It impacted society by making math problems easiers
One of the advantages of the abacus is that it is easy to use. Another is that it does not require electricity to work. You can use it no matter where you are.
Go and puncy one ande then se what hapens to your hand and then blame the abacus
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An Abacus has beads and strings.