What's the difference between patent licensing and patent transfer?

Patent license means that the patentee allows others to use the patent in a certain way in a certain area and for a certain period of time. The patentee who granted the license is the licensor, and Party B who received the license is the licensee. The patent right still belongs to the patentee as the licensor. Patent transfer is the act that the patentee transfers all the patents he has obtained to others. The party transferring the patent right is the "transferor"; The party that obtains the patent right is the "assignee". Once the patent right is transferred, the transferor no longer has any rights to the patent, and the transferee becomes the new owner of the patent and has the right to exercise all the rights of the patent right.