Regarding Hong Kong immigration, what is in-principle approval? What's the use?

In-principle approval is a process for applying for Hong Kong investment immigration.

In-principle approval refers to an approval after the Hong Kong Immigration Department has reviewed the personal documents and there are no problems with the documents. If you get the in-principle approval from Hong Kong, you can invest within 6 months; the in-principle approval cannot be extended. If you do not invest within 6 months, you need to reapply.