One of the many failed clones of Darth Sidious, Snoke was an artificially created strandcast genetically engineered on the hidden Sith planet of Exegol by Sidious and the Sith Eternal sometime after his first demise at the Battle of Endor in 4 ABY. ... Despite his origins, however, Snoke was not a Sith himself.

Was Snoke a failed clone?

Although Snoke was unsuccessful in bringing Rey to Palpatine and was unexpectedly killed by his protege Kylo Ren, Palpatine continued to pull the strings in order to reel in his granddaughter so he could finally achieve ultimate power." ... The post also confirms that Rey is the daughter of a clone of Palpatine.

Why did Palpatine clone Snoke?

It is revealed that Palpatine had created Snoke as a puppet to lure Ren towards the dark side, and to reclaim the galaxy through the First Order.