# HyperLogLog commands

> Commands for probabilistic cardinality estimation.

<CardGroup cols={2}>
<Card title="PFADD" href="/redis/commands/hyperloglog/pfadd">Add elements to HyperLogLog</Card>
<Card title="PFCOUNT" href="/redis/commands/hyperloglog/pfcount">Get estimated cardinality</Card>
<Card title="PFMERGE" href="/redis/commands/hyperloglog/pfmerge">Merge multiple HyperLogLogs</Card>
</CardGroup>