PoS involves the validation of data by network node operators. These Validators stake a designated portion of their coins/tokens from a blockchain to be eligible, this is considered collateral. Validators are chosen randomly, to an extent. Once chosen, the Validator confirms the transaction and upon block confirmation, they are rewarded in network transaction fees.
PoS is widely considered more sustainable for long-term use due to its lower energy consumption and scalability. However, some view it as plutocratic, governed by the wealthy, as it requires its validators to stake their tokens to participate. This means only those with enough tokens get to benefit from the blockchain consensus protocol.
Private & Consortium

Private blockchains are controlled by a centralized entity; usually a financial institution, business, charity organization, government entity, or individual. These allow only specific users to be selected and are implemented for specific tasks like shipping of goods, tracking foodborne illnesses, dissemination of information to projects, and financial transactions. They can be more secure than public blockchains because data is hidden from public knowledge.
Consortium blockchains are similar but are controlled by several parties instead of a single one. Data can be shared from entity to entity within the Consortium for security and logistical purposes. This technology can ensure supply chains are maintained in an efficient manner and decrease the risk of loss, theft, and delivery disputes.
The Future

As blockchain technology evolves, the possibilities become endless. Documentation, proof of ownership, identification verification, medical records, financial capabilities, and so much more are just on the horizon. Blockchain technology is revolutionizing industries across the globe. The Blockchain Revolution has begun!