Final answer:
A Point-to-Site VPN enables secure access from an individual client computer to a virtual network, serving remote workers. It differs from a Site-to-Site VPN, which connects networks, and ExpressRoute, which offers a private connection to Azure services.
Step-by-step explanation:
A Point-to-Site VPN lets you create a secure connection to your virtual network from an individual client computer. Unlike a Site-to-Site VPN, which connects two networks in different locations together, a Point-to-Site VPN provides secure access to the virtual network from a single client computer. It's typically used for remote workers to access resources within the company's virtual network as if they were directly connected to the network’s internal infrastructure. ExpressRoute, on the other hand, is a service that provides a private connection between an organization's on-premises infrastructure and Microsoft Azure data centers, bypassing the public internet entirely for greater reliability and security.