A method is a way to structure so "processed" or industrial activity. It may use some tools or none. When it uses tools, these tools are more specified by their inputs/outputs (so how they contribute to the achievement of the goal) that to how they operate.

More specifically:

- Kanban can be used outside of the SCRUM methodology. For example, nothing forbid to use Kanban in a Waterfall IT project during the implementation phase to track tasks progress

- SCRUM may use Kanban or some other equivalent tools to organise and track the differents tasks

However, both are historically associated (even if I guess that Kanban came from Toyota and the automotive industry, using lean and not "agile" or SCRUM)