It is a descriptive analysis of how users perform tasks using their product. It can be a step-by-step, a table, or even a text document that contains the narrative of the main tasks performed. It is very useful when defining which tasks are most important and to assess if any of them are too complicated for the user:
You can also do a competitive comparative task analysis, like this one comparing the checkout flow of different museums stores:
Visual representation of Comparative Competitor flow on the wall
