DOM manipulation refers to the process of dynamically modifying the structure, content, or style of a web page using Javascript. The Document Object Model (DOM) is a programming interface that represents the HTML elements of a web page as objects, allowing us to access and manipulate them.

In Javascript, we can use various methods and properties provided by the DOM API to interact with the elements on a web page. For example, we can select elements using their IDs, classes, or tag names and then modify their attributes, content, or styles.

To manipulate the DOM, we typically follow these steps:

1. Select the element we want to manipulate using methods like getElementById, getElementsByClassName, or querySelector.

2. Once we have a reference to the element, we can modify its properties, such as changing the text content, updating attributes, or altering CSS styles.

3. We can also create new elements dynamically using methods like createElement and append them to the DOM tree as child nodes of existing elements.

4. If needed, we can remove elements from the DOM using methods like removeChild or remove.

DOM manipulation is commonly used to create interactive web pages, update content dynamically, handle user interactions, or respond to events. It allows us to build dynamic and responsive web applications by modifying the structure and behavior of the web page in real-time based on user actions or other events.