didMount

The `didMount` lifecycle method is a function in certain JavaScript frameworks, most notably React, that executes after a component has been rendered to the DOM for the first time. It is part of the component's lifecycle, representing a specific phase in its existence from creation to destruction.

Once a component is created, it goes through a mounting phase where it is inserted into the web page. The `didMount` method serves as a hook into this process, allowing developers to perform actions that require the component to be fully present in the document. This could include fetching data from an API, setting up event listeners, or interacting with third-party libraries that need access to the DOM.

The primary use case for `didMount` is for side effects that occur after the initial render. Because the component is already in the DOM, any operations within `didMount` are guaranteed to have a stable environment to work with. For example, if you need to measure the dimensions of an element or manipulate it directly, `didMount` is the appropriate place to do so. It's important to note that `didMount` is only called once in the lifetime of a component. After this initial mount, subsequent updates will trigger different lifecycle methods.