Description: The interface declaration in TypeScript is a fundamental tool that allows developers to define the shape of an object by specifying its properties and methods. This syntax is used to create a contract that objects must adhere to, facilitating the writing of more structured and maintainable code. By defining an interface, a clear type can be established that describes the structure of the data, helping to prevent errors at compile time. Interfaces are particularly useful in software development, where clarity and organization of code are essential. Additionally, TypeScript allows for interface extension, meaning new interfaces can be created based on existing ones, promoting code reuse and the creation of type hierarchies. This feature also allows for the implementation of interfaces in classes, ensuring that classes adhere to the contract defined by the interface. In summary, the interface declaration in TypeScript not only improves code readability but also provides a robust framework for developing scalable and maintainable software applications.