A Sprint Backlog is a list of items that a development team plans to complete during the upcoming sprint in Agile software development. It contains the details of the tasks, the team responsible for them, and the expected timeline. The purpose of the Sprint Backlog is to ensure that every team member knows what they need to work on and when, and to help manage the progress of the sprint. In short, it's a plan for completing the work agreed upon in the Sprint Planning meetings.

In terms of implementation, the Sprint Backlog makes use of a task board or a Kanban board which visually represents the tasks in a sprint, their status, and their priority. This promotes transparency, communication, and collaboration among members of the development team.

Here's an example of a Sprint Backlog in JavaScript using Jira Software:

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const sprintBacklog = {
  name: "Sprint 1 Backlog",
  tasks: [
    {
      id: 1,
      summary: "Design login page",
      assignee: "John",
      status: "To Do",
      priority: 1,
      estimate: "2h",
    },
    {
      id: 2,
      summary: "Implement login page",
      assignee: "Mary",
      status: "In Progress",
      priority: 2,
      estimate: "4h",
    },
    {
      id: 3,
      summary: "Test login page",
      assignee: "David",
      status: "To Do",
      priority: 3,
      estimate: "2h",
    },
    {
      id: 4,
      summary: "Deploy login page",
      assignee: "John",
      status: "Done",
      priority: 4,
      estimate: "1h",
    },
  ],
};