private blockchain network requires an offer/invitation validated by the network initiator.It is usually set up by the network validator, where every participant holds the ultimate power to choose who can and cannot be a part of the network and perform transactions.
Every private blockchain network seeks either an invitation or permission to join. Being said, every participant will have the authority to choose the future entrants.
private blockchain network requires authorization from the network starter. To give control access or the transaction rights to other parties, it's not open for all. The private blockchain is majorly used in enterprise level applications by financial, healthcare and legal industries where the security, scalability and higher TPS are extremely important.