What actually makes a board "Kanban" instead of just a to-do list with columns
The defining mechanic of Kanban is the work-in-progress limit, not the columns themselves. Columns alone just visualize status; a WIP limit is what forces the underlying discipline of finishing work before starting more, which is the actual source of the method's benefit.
Kanban works for individuals, not just teams
Kanban originated in manufacturing and is heavily associated with team software development, but the same mechanics -- visible columns, a WIP limit, pulling rather than pushing work -- apply just as usefully to a single person managing personal projects, since the core problem it solves (too much half-finished work at once) isn't unique to teams.
Frequently Asked Questions
How many cards should my WIP limit allow?
There is no universal number, but a common starting point for an individual board is 2-3 cards in progress at once. If you consistently find yourself wanting more, that is a sign to examine whether work is genuinely progressing on all of them or just sitting there.
Does Kanban require special software, or can I use physical sticky notes?
Neither is required by the method itself -- physical sticky notes on a wall work exactly as well as digital software for enforcing the same WIP-limit discipline. Digital tools mainly add convenience for remote teams and searchable history, not a functional advantage for the core mechanic.