In what situations is it recommended to use interfaces in TypeScript?

Interfaces in TypeScript are recommended for use in the following situations:

• Defining contracts for objects to ensure that objects have a specific structure.
• Describing data formats, for example, for function parameters or return values.
• Ensuring type safety when working with classes and objects.
• Creating abstractions that can be implemented by different classes.
• Improving code readability and maintainability through explicit type descriptions.

Example:

interface User {
  id: number;
  name: string;
  email?: string; // optional field
}

function greet(user: User) {
  console.log(`Hello, ${user.name}`);
}

const user = { id: 1, name: "Ivan" };
greet(user);

Here, the User interface defines the structure of a user object, which helps prevent errors and enhances autocomplete in the editor.