<prompt> Generate a specific example of a data structure that can be used in a web application.  <response>: A specific example of a data structure that can be used in a web application is a tree. For instance, a forum-based web application may utilize a tree data structure to represent hierarchical relationships between posts and comments.Here is an example of this data structure in action:class ForumPost: def __init__self, author, content: A post is created by providing an author and the forum posts content. self.author author self.content content self.comments def add_commentself, comment: The add_comment method allows users to add comments to a forum post. self.comments.appendcomment class Comment: def __init__self, author, content: Just like a regular forum post, a comment has an author and content. self.author author self.content content self.replies def add_replyself, reply: This method allows users to reply to a comment, further nesting the conversations. self.replies.appendreply post ForumPostJohn Doe, This is an example forum postcomment_one CommentJane Doe, This is the first commentcomment_two CommentBob Smith, This is the second commentpost.add_commentcomment_onepost.add_commentcomment_tworeply_one CommentJohn Doe, This is a reply to the first commentcomment_one.add_replyreply_oneIn this example, a tree data structure is used to represent the relationship between posts, comments, and replies within a forum-based web application. The root of the tree is the ForumPost object, with each of its comments being the first level of branches on the tree. Subsequent replies to comments create additional levels of branches, allowing for a deeply nested conversation to take place. 