What layer of the OSI model is responsible for data encryption?

The Presentation Layer is responsible for data encryption in the OSI model because it serves as the interface between the application layer and the network. This layer is tasked with data translation, formatting, and encryption/decryption. Encryption at this stage ensures that data is secured before it is transmitted over the network, making it fundamental for maintaining confidentiality and data integrity. This includes converting the data into a format that can be securely sent and ensuring that it remains unreadable to unauthorized users.

The other layers, while essential for network functionality, do not specifically handle encryption. The Network Layer focuses on data routing and addressing, the Transport Layer is concerned with end-to-end communication and error handling, and the Application Layer interacts directly with user applications and services but does not directly manage encryption processes itself.