Web development is the process of creating and maintaining websites. It involves a variety of skills and technologies, including HTML, CSS, JavaScript, and programming languages like Python and Ruby.

HTML (Hypertext Markup Language) is the backbone of web development. It is used to structure the content of a website, such as text, images, and links. CSS (Cascading Style Sheets) is used to create the visual design of a website, including layout, colors, and fonts. JavaScript is used to create interactive elements on a website, such as forms, pop-ups, and animations.

Web developers can choose from a wide range of programming languages to build the back-end of a website. Python, Ruby, and PHP are some of the most popular languages used in web development. These languages are used to create the logic that runs on the server-side of a website, such as connecting to a database, performing calculations, and handling user input.

Web development also includes the process of deploying a website. This means making the website accessible to the public on the internet. Developers use web hosting services to store and serve the website files to the users.

In conclusion, web development is a multi-disciplinary field that involves a combination of programming, design, and testing to create and maintain websites. It is a fast-paced and ever-changing field with new technologies and frameworks emerging all the time, providing web developers with a lot of opportunities for growth and innovation.