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Format and code conversion services typically operate at the presentation layer of the OSI (Open Systems Interconnection) model.

The presentation layer is the sixth layer in the OSI model and is responsible for ensuring that data exchanged between systems is in a format that both the sender and the receiver can understand. This layer is concerned with data translation, encryption, decryption, compression, and other transformations to ensure compatibility between different systems.

Format and code conversion services at the presentation layer may involve:

1. Data Encryption/Decryption: Encrypting data for secure transmission and decrypting it at the receiving end to ensure confidentiality and integrity.

2. Data Compression/Decompression: Compressing data to reduce transmission overhead and decompressing it at the receiving end to restore the original data.

3. Character Encoding/Decoding: Converting characters from one character encoding scheme to another, such as ASCII to Unicode or UTF-8, to ensure compatibility between systems using different character sets.

4. Data Translation: Converting data between different formats or representations, such as converting between text and binary formats, or between different file formats.

5. Protocol Conversion: Translating data between different network protocols to enable communication between systems using different protocols.

Overall, the presentation layer plays a crucial role in ensuring interoperability and compatibility between heterogeneous systems by handling format and code conversion services.

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