# An overview of Placement Rules

+ Placement Rules is a replica rule system that guides PD to generate corresponding schedules for different types of data. 
+ By combining different scheduling rules, you can finely control the attributes of any continuous data range, such as the number of replicas, the storage location, the host type, whether to participate in Raft election, and whether to act as the Raft leader.
+ You can manually specify placement rules in Placement Driver (PD). 
+ Recommended to use Placement Rules in SQL. This offers a more convenient way to configure the placement of tables and partitions.

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Placement Rules were introduced in v5.0.