from where did it originate?
It is thought to have developed after the formation of planets from the primordial protoplanetary disc.
Oort cloud
The Oort cloud is thought to have developed after the formation of planets from the primordial protoplanetary disc approximately 4.6 billion years ago.
what is referred to as oort cloud? A theoretical cloud of predominantly icy planetesimals proposed to surround the Sun at distances ranging from 2,000 to 200,000 au
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Oort cloud [SEP] Origin
The scattered disc might still be supplying the Oort cloud with material. A third of the scattered disc's population is likely to end up in the Oort cloud after 2.5 billion years.