How is Kanban different from Scrum?

Both Kanban and Scrum focus on releasing software early and often. Both require highly-collaborative and self-managed teams. There are, however, differences between the approaches:

Kanban		Scrum
No prescribed roles		Pre-defined roles of Scrum master, Product owner and team member
Continuous Delivery		Timeboxed sprints
Work is ‘pulled’ through the system (single piece flow)		Work is ‘pulled’ through the system in batches (the sprint backlog)
Changes can be made at any time		No changes allowed mid-sprint
Cycle time		Velocity
More appropriate in operational environments with a high degree of variability in priority		More appropriate in situations where work can be prioritized in batches that can be left alone

Organization, culture and team dynamics often determine which method is the best fit.