How clustering for scale out works in PostgreSQL

I am *expecting 1000+ hits to my PostgreSQL DB* and I doubt my standalone DB
will be able to handle it.

So I want to *scale out by adding more servers to share the load*. For this,
I want to do clustering.

I am *curious to know how clustering works in PostgreSQL.* (I don't want to
know how to setup cluster - as of now. Just want to know how clustering
works).

When I look at some of the content available while googling, I am getting
more and more confused, as I find that in most of the sites, clustering is
used interchangeably with replication.

*My purpose is scale out to handle more load, not high availability.*

Can any one please help me with the details or guide me to use urls.

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