**Thunk** is a function that wraps another function or expression to delay computation. Thunk can also be used to add additional calculations to a function.  
Thunks provide lazy evaluation and are widely used in functional programming languages.  

> If you are looking for **Redux Thunk**, check out this answer: [What is Redux Thunk?](https://www.educative.io/answers/what-is-redux-thunk).

# Example

Here's an example of using a thunk `myFunction` to delay evaluation of an expression in JavaScript:
```javascript
// calculation of 1 + 2 is immediate
let x = 1 + 2;
 
// calculation of 1 + 2 is delayed
// myFunction can be called later to perform the calculation
let myFunction = () => 1 + 2;
```

# Applications

- Functional programming and lazy evaluation
- Inheritance of multiple interfaces in object-oriented programming
- Interoperability between software modules

What is a "thunk"?

Thunk wraps a function to delay computation, enabling lazy evaluation, and additional calculations in functional programming.