Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What are the three major pieces of software that are used in web development?

### Response:
The three major pieces of software used in web development are HTML, CSS, and JavaScript. HTML is used to structure a website while CSS is used to style the website. JavaScript is used to add interactivity to the website, as well as performing calculations and control the flow of the website.