An impediment is an issue, a problem, or anything that is preventing a team member from being able to complete work on a story and/or task. Impediments are often discussed during standup by team members.

It's often helpful to think of impediments in relation to business value. For example, your team only commits to work items with the highest business value. Anything that is blocking the completion of these work items may prevent your team from delivering business value. It is the job of the scrum master to help facilitate a resolution to the impediment. Some impediments are solved quickly and easily, while others may require the creation of one or more actual work items as part of the resolution.