What is the difference between 'type' and 'interface' in TypeScript?

In TypeScript, type and interface have similar purposes — describing types, but there are differences:

• interface is intended for describing the structure of objects and can be extended (extends) or implemented (implements) by classes.
• type is more versatile, allowing the creation of aliases for primitives, unions, intersections, and other types.

Example:

interface IUser {
  name: string;
  age: number;
}

type ID = string | number;

// interfaces can be extended
interface IEmployee extends IUser {
  salary: number;
}

// types can be combined
type Employee = IUser & { salary: number };

Also, interfaces support declaration merging, whereas types do not.

Overall, interfaces are often recommended for describing objects, while types are suitable for complex types.