Azure DevOps is a cloud-based service that provides a suite of tools for software development and delivery. Here are some definitions for some of the key terms in Azure DevOps:

Work Items: Work items are the building blocks of the development process. They represent individual units of work that need to be completed, such as features, bugs, or tasks.

Boards: This is a tool in Azure DevOps that helps you manage your work items. You can create, prioritize, and track work items on a board. Boards provide a visual way to manage work items and collaborate with your team.

Backlogs: Backlogs are a list of work items that need to be done in a project. Backlogs are usually sorted by priority and include user stories, bugs, and other work items.

Sprints: Sprints are a short period of time, usually one to four weeks, in which a team focuses on completing a set of work items from the backlog. Sprints help teams to work in an agile manner, where work is delivered in short, iterative cycles.

Queries: Queries are a powerful tool in Azure DevOps that allow you to filter and search for work items based on various criteria, such as status, priority, or assigned to.

Delivery Plans: Delivery Plans is a tool that provides a roadmap of work items across multiple sprints. It helps you to plan and track work items over time, and it helps stakeholders to see how work is progressing.

Plans: Plans are a high-level view of work in a project. Plans help to define the scope of the project and the major milestones. Plans may include multiple sprints and can be used to communicate project status to stakeholders.

Repos: Repos is a tool in Azure DevOps that provides Git and/or TFVC (Team Foundation Version Control) for your code. It allows you to collaborate with your team and manage your code changes.

Pipeline: Pipelines are a way to automate the building, testing, and deployment of your code. Azure DevOps provides a pipeline tool that allows you to create and manage pipelines that integrate with your source code repositories and deployment targets.

In summary, Azure DevOps provides a suite of tools to help you manage the entire software development lifecycle, from planning and development to testing and deployment.