Backlog consists of a list of items for a product like feature, enhancements, bugs, support tickets, and so on. It can be product backlog or Sprint backlog.

Scrum is an Agile development methodology to deliver in an iterative way in fixed amount of time.

Sprint is an iteration in Scrum to deliver a product functionality in a time box of nearly a month or less.

Product backlog is a list of requirement items for a product such as features, bugs, and so on.

Sprint backlog is a list of items from product backlog picked up to deliver in a Sprint.

Epic is a large functionality for the product which can further be divided into user stories to be picked up in several Sprints.

Story is a conversation requirement for a part of the functionality which can be independently delivered and tested in a Sprint.

Task is a technical task or subtask for a Story to be done or performed by the team members and developers to deliver a user Story.

Story point is a number given to a Story to decide its relative complexity.

Burndown chart is a chart to display actual and estimated amount of work, in Story points, hours or business value points over time in a particular Sprint.

Velocity is the measurement of work either in Story points, custom business value, or hours that can be delivered by a team in a Sprint.

Kanban is a system to reduce waste to deliver business value by controlling and limiting the work in progress.

Cycle time is the time taken by an issue to change status in a flow, the time taken from work started until work finished on an issue.

Filter is a query with conditions to restrict the number of issues displayed on the screen.

Quick filters are configurable filters which can be stored and displayed on board to quickly filter the displayed results.

Swimlane is a way of grouping and categorizing lists of issues to be displayed on the task board in horizontal bands.