The Box Model is a fundamental concept in web design and development that describes how elements on a webpage are structured and displayed. Each element is represented as a rectangular box, which consists of four parts: content, padding, border, and margin. The content is the actual text or image, while padding is the space between the content and the border. The border surrounds the padding, and the margin is the space outside the border that separates the element from others. Understanding the Box Model is essential for controlling layout and spacing in web design. By adjusting the sizes of padding, borders, and margins, developers can create visually appealing and well-structured pages. This model is crucial for working with CSS, as it allows for precise positioning and alignment of elements, ensuring a consistent look across different devices and screen sizes.