What is the highest layer of the OSI Protocol Stack?

The highest layer of the OSI Protocol Stack is the Application layer. This layer is responsible for providing network services directly to the user's applications. It facilitates the interaction between software applications and the underlying network, enabling users to perform tasks such as file transfers, emails, and web browsing.

At this layer, protocols like HTTP, FTP, SMTP, and DNS operate to ensure that application data is properly formatted, transmitted, and received. It serves as the interface for user applications, translating network services into a user-friendly format. This makes the Application layer crucial for enabling communication and functionality across a network, as it ultimately bridges the gap between the user's needs and the network's capabilities.