Abstract Syntax Notation (ASN.1) is a formal notation used to describe data structures in a way that is independent of programming languages. It provides a standardized way to define the syntax of data types, making it easier to share and understand data across different systems and applications. ASN.1 is widely used in telecommunications, networking, and various protocols. ASN.1 defines data types such as integers, strings, and sequences, allowing for complex data structures to be represented clearly. It also supports encoding rules, which specify how these data structures should be serialized for transmission or storage. This ensures that data can be accurately interpreted by different systems, enhancing interoperability.